Mapping Mountains – Trimble Surveys – Moel y Gamelin

05.05.18  Coed Hyrddyn (SJ 200 439)

Coed Hyrddyn (SJ 200 439)

Coed Hyrddyn nestles between two relatively busy A roads and a river and canal, it feels as if the hill has been squeezed in to the landscape as it is dominated by higher hills in all directions, and yet it is relatively prominent for its height and commands extensive views, it can be combined with adjacent hills or as in today, it can be the sole objective making an enjoyable few hours in warm sunshine with good friends.

Lou had set me the objective of a small walk near Llangollen on good paths that would last between 2-3 hours and Coed Hyrddyn seemed the obvious chose.  I’d visited the hill on two previous occasions, the first in December 2003 when I combined a number of hills in a good winter walk, and the second along with John, Graham and Mark when we surveyed the hill for Hump status in February 2013.  On both visits the weather proved somewhat cold with early frost and sleet showers respectively, today the hill was bathed in early summer sunshine.

We started the walk from beside the Motor Museum next to the Llangollen Canal and walked the short distance back up the road to a track on the left which is also a public footpath and heads north toward Abaty Glyn y Groes (Valle Crucis Abbey).

Setting off toward the hill

The land sparkled with summer growth with green fields running with new born lambs and a radiant blue sky above, nearing the Abbey Farm I stopped and chatted with Jonathon Davies and Edward Jones who were working in the adjacent field, and made place-name enquiries, afterward we continued toward the farm and the Abbey.

The Abbey is now under the care of Cadw and was built in 1201 by the Prince of Powys Fadog; Madog ap Gruffydd Maelor.  It fell in to disrepair after the dissolution of the monasteries in 1537, and it still commands attention with its west end entrance striking skyward.

The west entrance to the Abbey

Beyond the Abbey we crossed the A 542 road and used a foot stile to gain the lower slopes of Coed Hyrddyn, these we followed around the hill’s base on a narrow path that led steeply up its northern flank.  To the west and across the River Eglwyseg, Moel y Gamelin dominated the view, almost pyramidal it looked down on all near hills, whilst across to the east Castell Dinas Bran rose in a great lump of a hill.

Heading up the northern flank of Coed Hyrddyn

Moel y Gamelin

Abaty Glyn y Groes and Castell Dinas Bran

The summit ridge of Coed Hyrddyn has a number of rounded and grassed tops with a good path between and the early summer warmth had brought walkers out on to the hill, with a small group standing beside the high point as we made our way toward it.

Heading for the summit

The summit of Coed Hirddyn consists of a small grassed area and as the Trimble gathered its customary five minutes of data I sat with Lou, Debs and Huw and looked out to the west and bathed in the tranquillity and warmth that the day had brought.

Gathering data at the summit of Coed Hyrddyn

After packing the Trimble away we continued on the good path down toward the car park at the southern end of the hill, past stunted gorse bushes as a steam train chugged up the valley below whistling as it went.

Heading down

Once off the hill we sat beside the canal and river with glasses of cider, fizzy water and an ice cream before leisurely walking on the canal tow path back to the car. 

It had been a good way to spend a few hours in the sunshine on a beautiful small heighted hill in another lovely area of the country that I love.

Survey Result:

Coed Hyrddyn (significant name change)

Summit Height:  232.6m (converted to OSGM15, Trimble GeoXH 6000)  232.4m (converted to OSGM15, Leica GS15)

Summit Grid Reference:  SJ 20028 43944 (Trimble GeoXH 6000)  SJ 20029 43943 (Leica GS15)

Bwlch Height:  130.4m (LIDAR)  130.4m (converted to OSGM15, Leica GS15)

Bwlch Grid Reference:  SJ 20049 44655 and SJ 20051 44657 (LIDAR)

Drop:  102.2m (Trimble GeoXH 6000 summit and LIDAR bwlch)  102.0m (Leica GS15)

Dominance:  43.89%

For further details please consult the Trimble Survey Spreadsheet

Mapping Mountains – Trimble Surveys – Mynydd Epynt

23.09.17  Pen y Crug (SO 029 303)

Pen y Crug (SO 029 303)

Pen y Crug overlooks Aberhonddu (Brecon) with the town nestling against the Afon Wysg (River Usk) as it ebbs forever eastward.  The hill is crowned by a triangulation pillar and the remains of an impressive Iron Age hill fort and gives expansive views to the higher southward hills.

Although passing close to Aberhonddu on many an occasion I’d never stopped to visit Pen-y-crug, and with a planned lunchtime meal and wander round Hay, Lou and I thought taking in a small hill ideal to add to the day’s activities.

We approached from the south-east following a bridleway consisting in part of tarmac and concrete as it headed up beside enclosed hedgerows toward the last inhabited house or two before open hillside gave access to the upper part of the hill.

Heading up the path toward Pen y Crug

Driving west from Worcester the weather had proved a murky combination of grey low mist and persistent drizzle, not an ideal combination for a hill walk, but a slight brightness pervaded the land further west and as we walked up the bridleway the cloud base had risen and the rain had thankfully stopped.

The enclosed nature of the lower part of the walk was in contrast to the upper part of the hill as a greened path led beside coloured autumnal bracken through the hill’s old defensive ditches toward the summit.

The view south-east down the path we'd just come up

Glimmers of brightness slowly showed as we approached the trig pillar, whilst Lou headed off to admire the view I set the Trimble atop my rucksack and activated it to gather the allotted 300 datum points and five minutes of data.

Lou with Aberhonddu (Brecon) nestled in the valley below

The summit consists of closely cropped grass that wouldn’t be out of place on the putting green of a golf course, with the high point about five metres from the base of the trig pillar which is enclosed in stone with its upper part painted white and festooned in a red dragon motif.

Gathering data at the summit of Pen y Crug

Once data were stored and the Trimble closed off and packed away we retraced our inward route back down the hill where sunshine and warmth greeted us.

Survey Result:

Pen y Crug 

Summit Height:  331.2m (converted to OSGM15) (Trimble GeoXH 6000)   

Summit Grid Reference:  SO 02927 30312 (Trimble GeoXH 6000)

Bwlch Height:  219.9m (LIDAR)

Bwlch Grid Reference:  SO 02162 30880 (LIDAR)

Drop:  111.4m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  33.62% (Trimble GeoXH 6000 summit and LIDAR bwlch) 

(Lesser Dominant addition)

For details on the 2nd visit to Pen y Crug

For further details please consult the Trimble Survey Spreadsheet

Mapping Mountains – Trimble Surveys – Worcestershire Beacon

30.04.17  Midsummer Hill (SO 759 375) and Eastnor Park (SO 752 378)     

Midsummer Hill (SO 759 375)

The Malvern Hills are justifiably popular and throngs of people descend to their well-maintained paths and shapely summits most weekends.  However, the lower summits on the southern extremity of the hill range give good walking with the benefit of fewer people, and this is where we headed to for a couple of hours this afternoon.

The main summit we planned on visiting is Midsummer Hill which has the remains of an ancient hill fort encircling its summit area, if weather and inclination permitted we also wanted to combine this hill with the lower summit to its north north-west that has an obelisk crowning its high point.

Both hills can be easily combined and we set off from the south where a free car parking area gives access to steep slopes heading in to deciduous woodland.  Although the sky was grey and the weather forecast predicted rain for later in the afternoon the woodland was bathed in serene blue as a multitude of blue bells cast their beautiful spell.  Late April and early May are a special time on the lower hills when slopes can become a myriad of succulent blues interspersed with new shooted greens as blue bells gather amongst spring’s new growth.

Blues and greens of the lower hills

The steep path gained height quickly beside masses of tangled brambles and undergrowth and proved a relatively easy way up toward the summit of Midsummer Hill.  During the wooded ascent an occasion trig was blown from overhead branches signalling the windy conditions on the top. 

Lou heading through the wood toward the summit of Midsummer Hill

The summit of Midsummer Hill is a few metres north of a memorial shelter that was built by Reverend H L Somers (who gave the hill to the National Trust) in memory of his son who was killed in the First World War.  As I assessed the lay of land to find the highest point of the hill, Lou took shelter on the leeward side crouching down out of the wind looking out toward the west and the continuation of our route to the obelisk.

Information board on the top of the memorial shelter close to the summit of Midsummer Hill

Once the Trimble was aligned with the high point of the hill and gathering data I stood back and hoped that no one else would visit the summit in the next five minutes, one couple approached, but they kept to the earthen embankment below the high point and soon disappeared from view, otherwise we had the summit to ourselves.

The summit of Midsummer Hill with the Trimble on the high point

The Eastnor Obelisk from Midsummer Hill

Gathering data at the summit of Midsummer Hill

Looking north to the higher Malvern Hills

By the time the Trimble had gathered its allotted five minutes of data the sky toward the west had turned a slate grey and with rain forecast for the afternoon we pressed on down the northern slopes of Midsummer Hill through woodland on a good path toward the hill’s connecting col.  Once at the col I set the Trimble up to gather data but the enclosed nature of where it was positioned did not encourage it to reach its 0.1m accuracy level before data should be logged, and after waiting ten minutes whilst directing a Landover and trailer and a few walkers to one side of where it was placed, I closed it off without any data having been collected and we made our way up toward the obelisk.

Heading down to the col

The Trimble positioned at the col waiting for the accuracy level to reach 0.1m before data should be logged

The obelisk is big and commands the southern extremity of the Malvern Hills, however our stay beside it was not long as the first rain drops were now falling and the western sky looked as if it was going to deposit lots of the wet stuff on us at any moment.

Approaching the Eastnor Obelisk

The higher Malvern Hills

Descending quickly to an earthen track we followed this until a gate gave access to open fields, these we followed back toward another track and then on to the car.  This descent proved a lot of fun as one in the party had concerns about killer rams and being off route and not on a main path, the pace of the descent and the fits of internal giggles thinking of killer rams made it hard for me to keep up, we arrived back at the car having dodged the rain which looked as if it had concentrated on the higher summits.  The walk proved a great couple of hours investigating the southern Malvern Hills whilst dodging the rain and the prospect of any rogue killer rams.

 ills.

Looking back toward the obelisk with the infamous field full of killer rams

Postscript: 

Since visiting these hills full LIDAR coverage is now available.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height and positional data that is now freely available for England and Wales.  Consequently the numerical details for these hills have been analysed using this technique, resulting in LIDAR being used for the points not surveyed with the Trimble GeoXH 6000.

 

LIDAR image of Eastnor Psrk (SO 752 378)

Survey Result:

Midsummer Hill

Summit Height:  285.5m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SO 75957 37516 (Trimble GeoXH 6000)

Col Height:  204.5m (LIDAR)

Col Grid Reference:  SO 75666 37999 (LIDAR)

Drop:  81.0m (Trimble GeoXH 6000 summit and LIDAR col)

Dominance:  28.37% (Trimble GeoXH 6000 summit and LIDAR col)

Eastnor Park

Summit Height:  241.0m (LIDAR)

Summit Grid Reference:  SO 75227 37824 (LIDAR)

Col Height:  220.9m (LIDAR)

Col Grid Reference:  SO 75612 38173 (LIDAR)

Drop:  20.1m (LIDAR)

Dominance:  8.33% (LIDAR)

For further details please consult the Trimble survey spreadsheet

1,000 Welsh P30s – Mapping Mountains – Trimble Surveys – Pumlumon

1,000 Welsh P30s

Mapping Mountains – Trimble Surveys – Pumlumon

15.04.17  Bryn y Fan (SN 931 884)

What is a P30 and where do they come from?

P30 is an abbreviated term for hills that have 30m minimum prominence, with the ‘P’ standing for ‘Prominence’ and the ‘30’ standing for 30m.

For the uninitiated the terminology within hill listings and their chose of criteria is sometimes hard to fathom, hoping that the following explanation does not add to uninitiated confusion I will try and explain what prominence is.

Simply put, prominence is the vertical height gain between col and summit.  A fuller explanation for prominence is the height difference between the summit and the col connecting the hill to the next higher summit along the watershed.

Prominence is a relatively new term in use within Britain, with its use having been adopted from prominence based groups in America.  The term prominence is also referred to in Britain as ‘drop’ and reascent’, with the former being the drop in height from summit to col, and the latter being the reascent in height from col to summit.

The use of prominence as part of criteria in a hill list gives the list compiler the tool to differentiate between one hill’s inclusion and another, otherwise if solely based on a minimum height criterion a list compiler would have to resort to subjectivity to differentiate between one hill’s inclusion and another.  By using prominence objectivity is prioritised over that of subjectivity.

The use of prominence has dictated the majority of hill lists over many years, and although list compilers have experimented with many other forms of qualification, including remoteness and dominance, the popularity of using prominence speaks for itself; it works and produces listings that are easily understood and popular for the hill bagger.

The origins of P30s

The use of prominence was established with some of the early hill list compilers such as John Rooke Corbett (1) and Edward Moss (2) who used a single ring contour from maps of the day to differentiate between one hill’s inclusion and another.  The use of a single ring contour was soon developed by Carr and Lister (3) into using a minimum prominence of 100ft which was described as the following; ‘if it rose by more than 100 feet above the lower ground connecting it with any greater height’.  By using P100ft Carr and Lister had paved the way for this imperial height to subsequently be used by its nearest whole numbered metric equivalent of 30m, however the timeframe between each was 59 years with each list being specific to hills in Wales.

It was 1925 when Carr and Lister used P100ft as part of their criteria and 59 years later in 1984 the use of P30m was first employed by Terry Marsh (4); the use of P30m has subsequently been used by many list authors including Michael Dewey (5), Alan Dawson (6), Myrddyn Phillips (7), Clem Clements (8) and Mark Jackson (9).  By doing so each in turn is following an imperial height value that has been metricised, there is an erroneous quaintness about this that seems to predominate many British listings, as the use of imperial measurement is now only used by a few nations worldwide and yet we British still rely upon it even when listing hills using metric measurement!

However, even though the use of P30 is now standard amongst many British based hill list compilers there is also a fundamental quality to such hills, as a minimum of P30 just seems to be right, as it produces sufficient hills in most lists to give an adequate challenge for prospective completers and gives an adequate height rise to differentiate between hills and an adequate ascent for the hill bagger.  And although P50 hills have their supporters it seems that P30 hills are here to stay.

Pushing the boundaries

Listing hills can easily become an addiction; there is eloquence to the procedure, a fulfilment of purpose as each height band and contour checked produces another qualifying hill to be listed.  This procedure is time consuming, yet it can be therapeutic in its complicated simplicity.  The use of P30 in this procedure has produced listings that have stood the test of time; with listing down to P30 pushing the boundaries of map study which took many years of laborious work and which was conducted by a few dedicated people. 

A brief synopsis of published lists using minimum of P30 follows:

Terry Marsh – Welsh P30s at and above 600m in height

Michael Dewey – English, Manx and Welsh P30s at and above 500m and below 2,000ft (609.6m) in height

Alan Dawson – Scottish, English and Welsh P30s at and above 600m in height (accumulated from various personal listings).

Myrddyn Phillips – English, Manx and Welsh P30s at and above 400m and below 500m in height.  Welsh P30s at and above 30m and below 400m in height.

Clem Clements – Scottish, English and Welsh P30s at and above 300m in height and below 600m in height.

It was the above listings by Michael Dewey, Alan Dawson, Myrddyn Phillips and Clem Clements that formed the bulk of the Tumps that Mark Jackson duplicated when he collated the Tumps (thirty metre prominences and upward) in 2009.  This is the list that finally pulled together all of the other P30 lists and grouped them under one title, the end product was approximately 16,800 hills that is seemingly getting greater in number as new hills are added on a near weekly basis.  

Personal achievement

When Wales was mapped down to P30 level it opened the door to a complete mainland completion, and as a country Wales lends itself to this as with just over 2,300 mainland and island P30s, and with many of the latter having their own access difficulties, the challenge to complete each and every mainland P30 is feasible and will no doubt, one day, be completed.

I started bagging Welsh P30s in 2000 when I concentrated on the Deweys, however this was more a Dewey bag rather than a P30 bag, in 2002 my attention then turned to the listing of Pedwar hills, but again this was more a list bag rather than a P30 bag.  However, each of these lists and their higher counterparts of the Welsh Hewitts are mere sub lists within the whole.  When the remaining lists to all the Welsh P30s were finally published in 2004 I knew that a mainland completion was feasible, and although I did wonder if I could attain such a thing my approach was one of chipping away in preference to outright concentration on one specific task.  Other things, such as life, occasionally gets in the way of major hill bagging activity, but my total crept ever upward and toward the end of 2015 I decided to check all my bagging journals against all my updated lists and re-visit any hill whose known high point had subsequently moved since I visited, and also survey a number of hills whose status was marginal. 

This re-checking and re-visiting continued for a number of months and my bagging activity nudged my total upwards into the 960s, I then started to plan a September 2016 finish for my 1,000^th Welsh P30.  But life and events got in the way as a high speed shunt by a van when I was waiting at temporary traffic lights ended with me in A&E with whiplash and periphery injuries, this kept me off the hills for a number of weeks and when I got back onto them I ended up with a knee injury which has just been diagnosed as a tear to my rear shock absorber which key-hole surgery will hopefully rectify.  These minor scuffles with a mid-life body and the added bonus of a probable cracked rib sustained when protecting my right knee whilst getting out of the bath and slipping with the resulting full weight of my body falling onto the side of the bath, ribs first, meant that any 1,000^th Welsh P30 completion was put on indefinite hold.  And when my body partly recovered I was met by Aled Williams’ enthusiastic analysis of LIDAR data when the status of many P30s in Wales was being swapped and deleted on what seemed to be a nightly basis, it took all my concentration just to keep up with any current total I had achieved and as I crept ever closer to the 1,000 magic mark I had to ask Aled to stop sending me LIDAR results otherwise he may reclassify a hill to P30 status that I had already visited and my 1,000^th celebratory completion would become no more than an arm chair tick.

With Aled restraining himself and with my Welsh P30 total in the 990s I visited local hills and pushed my total upwards to 999.  I’d decided to keep Bryn y Fan for my 1,000^th Welsh P30 as it looked like a fine hill with expansive views and has a good path to its summit and a large car park at its base; it is also relatively close to where I live.  I set the date of 15^th April for the walk and a time of 12.00 noon to meet, this was over the Easter bank holiday weekend and I hoped that the weather would be favourable and that any rain would keep away for the couple of hours spent on the hill.

On the hill – Bryn y Fan – completing 1,000 Welsh P30s

My last personal celebration on a hill was in 2002 when I completed a monthly calendar round of the Welsh Nuttalls and immediately followed this with the completion of my 16^th round of the Welsh Nuttalls.  Later that same year I also completed the Welsh Deweys, otherwise the only completion celebrations I have attended have been those of friends.

Leading up to the 15^th April I sent a number of emails to friends asking if they would like to attend and again hoped for good weather, and as the preceding days led toward the 15^th it seemed that a 24-hour weather window was going to give dry, albeit blowy and chilly weather for the Saturday with the preceding day and following day both plagued with rain.  I woke early on the 15^th and whilst doing work on my blog noticed a dark cloud outside, five minutes later it was drizzling and 30 minutes later it was raining, this wasn’t forecast!

When Lou arrived the rain had stopped, however after picking Huw and Debs up we had showers most of the way driving through Newtown and Llanidloes, it seemed the celebration was going to be a damp affair.

Pulling in to the large car park beside Bwlch-y-gle dam at the base of Bryn y Fan I recognised the figure walking down the road; it was Alex who had just completed his 1,000^th Welsh P30 a few minutes earlier, waiting in the car park were Charlie Leventon and Mark Trengove and within a few minutes David Purchase and Ed had also arrived.  Soon Carole Engel and Alan Greenwood, and Jeff and Enid Parr were parked and getting their boots on, the contingent were almost complete and as the last few windswept rain drops fell Darrin arrived and made our 14 strong party complete.

Preparing to set off (L-R); Charlie, Lou, Debs, Huw, Ed, Alex, Mark, Enid, Jeff, Carole, Alan and David

Although grey skies were ever near the few raindrops that fell as we gathered to set off was the last rain of the day and what could have been a very soggy affair turned out to be dry, which is all I had hoped for.

A good green track led down under the earthen sides of the Bwlch-y-gle dam and swung southward before heading north-east up the slopes of Bryn y Fan.  The track proved slightly muddy in its lower part but the strong breeze had dried the ground higher up. 

Dodging the mud

It was good to be with friends who I had had the pleasure of doing so many hill walks with, some of them such as David, Jeff, Enid and Carole I only see once a year or so, others like Charlie and Ed live locally so are only a phone call away from getting out on the hill.  As we rounded the corner of the track before heading upward Mark suggested doing an interview on top, and although I’d brought my digi-camcorder I’d left it in my car with little intention of filming proceedings, but upon Mark’s suggestion I became enthused and dashed back to get it, when I re-joined the track a number of people were already heading upward out of site whilst Charlie waited beside a gate and we subsequently brought up the rear, slowly making our way up the zig zagging track as it gained height and the view opened up.

The start of the uphill

Charlie Leventon

Below us Clywedog glimmered as patches of whiteness developed in the sky and across the valley the shapely profile of Bryn y Tail gleamed back toward us, by now the view had opened up and any shower clouds were distant and the prospect of dry conditions during the walk was a thankful probability. 

Bryn y Tail (SN 916 874) with Llyn Clywedog below

The broad green path continued toward the upper part of the hill which consists of heath and moor, it diverted from the area of the summit a few minutes’ walk below the highest point, and we followed a narrow sheep track heading off the main path aiming toward the summit.

Nearing the summit

The high point of Bryn y Fan is a small rocky knoll a few metres from its trig pillar, as I walked toward it the majority of people were gathered around the trig with a few forming an arch with their walking poles for the ceremonial last few metres to the summit.  This was the first time I’d walked through a ceremonial arch of walking poles toward any summit, I quite enjoyed it!

Beside the trig

Gathering near the summit

The ceremonial arch of walking poles.  Photograph © Charlie Leventon

Reaching the top was fun, and was more so when shared with good hill walking friends.  As photographs and videos were taken I called Alex over as he had achieved his 1,000^th Welsh P30 about an hour before me, we stood beside the summit, posed for a few photographs and quickly dashed down on the leeward side of the hill out of the wind to de-camp for bubbly and lots of cake.

At the summit of Bryn y Fan with Alex

On occasions such as this it is hard to catch up with everyone as usually the ascent is taken at your own pace and the after-reaching-the-summit cake eating and alcohol swigging can all be a bit of a blur.  During our sheltered cake and Cava fest I set the Trimble up aligned with the highest part of the small embedded summit rock and gathered what proved to be 11 minutes of data.  It felt good to be here surveying with the Trimble as friends chatted below. 

As the multitude of cake on offer was quickly devoured Mark and I sneaked off to find a sheltered spot for an interview on Welsh P30s, as ever Mark proved a whizz behind the digi-camcorder and my thanks to him for this suggestion as it will form a lasting document of my day on the hill.

Gathering data with the Trimble GeoXH 6000 at the summit of Bryn y Fan

Enjoying the cake and bubbly

The Trimble set-up position at the summit of Bryn y Fan

After about 40 minutes on the summit it was time to make a move and the descent proved fun as the hills all around sparkled in intermittent sunshine.  We retraced our inward route downward toward the awaiting cars and said our goodbye’s as various people headed off to do a myriad of things, with Jeff and Enid Dewey bagging, Mark taking Alex back to Mold for an onward train toward Conwy, David driving back to Bristol, Ed heading toward Montgomery, Charlie picking off a few more P30s on his way home to Shrewsbury and Carole and Alan heading to the end of the Llŷn peninsula to celebrate Carole’s completion of the Welsh Marilyns on Mynydd Anelog.  This left me and Lou, and Huw and Debs to follow Darrin to his and Lisa’s still relatively new house in Trefeglwys for coffee and chat.  It was good to be with friends, old and new, relaxing over coffee and good conversation.

Heading down

Down toward the awaiting cars

After leaving Darrin and Lisa our day continued toward the midnight hour with a road trip hunting out never visited pubs and forgotten pubs that are now boutique hotels, followed by an excellent meal in the Sun Inn at Clun and last orders in the Oak in Welshpool.  It had been an excellent day and my thanks to everyone who attended as it was good to share my 1,000^th Welsh P30 with such good friends, old and new.

Myrddyn Phillips (April 2017)

    

Survey Result:

Bryn y Fan

Summit Height:  482.0m (converted to OSGM15)

Summit Grid Reference:  SN 93123 88494

Bwlch Height:  307.2m (LIDAR)

Bwlch Grid Reference:  SN 92775 89173 (LIDAR)

Drop:  174.8m (Trimble summit and LIDAR bwlch)

Dominance:  36.26% (Trimble summit and LIDAR bwlch)
  

For further details please consult the Trimble Survey Spreadsheet

1911 John Rooke Corbett ‘Twenty-Fives’ published by the Rucksack Club Journal (1)

1933 Edward (Ted) Moss ‘Some New Twenty-Fives’ published by the Rucksack Club Journal (2)

1940 Edward (Ted) Moss ‘The Two-Thousands of Wales’ published by the Rucksack Club Journal

1925 Herbert R C Carr and George A Lister ‘The Mountains of Snowdonia’ published by John Lane The Bodley Head Limited of London (3)

1984 Terry Marsh ‘The Summits of Snowdonia’ published by Robert Hale (4) 

1985 Terry Marsh ‘The Mountains of Wales’ Hodder and Stoughton

1995 Michael Dewey ‘Mountain tables’ published by Constable (5)

1995 Alan Dawson ‘The Murdos’ published by TACit Tables (6)

1997 Alan Dawson ‘The Hewitts and Marilyns of Wales’ published by TACit Tables

1997 Alan Dawson ‘The Hewitts and Marilyns of England’ published by TACit Tables

1999 Alan Dawson ‘Corbett Tops and Corbetteers’ published by TACit Tables

2004 Alan Dawson ‘Graham Tops and Grahamists’ published by TACit Tables

2002 Myrddyn Phillips ‘400m hills of England, Isle of Man and Wales’ published on the RHB Yahoo Group file database, with subsequent publications in 2004 ‘The Welsh 400 Metre Peaks’ on v-g.me website and 5everdene website, following co-authored with Aled Williams 2013 ‘Y Pedwarau’ by Europeaklist, 2014 ‘Y Pedwarau’ by Haroldstreet and 2017 ‘Y Pedwarau’ by Mapping Mountains (7)

2004 Myrddyn Phillips ‘The Welsh 300 Metre Peaks’, ‘The Welsh 200 Metre Peaks’, ‘The Welsh 100 Metre Peaks’ and ‘The Welsh 30m – 99m Peaks’ published by v-g.me website and 5everdene website

Dates of publication unknown (to me) Clem Clements produced P30 listings to the 300m – 500m hills of Scotland, England and Wales with a variety of other prominence based listings also compiled (8)

2009 Mark Jackson ‘Tumps’ published on the RHB Yahoo Group file database (9)