Some years ago I started a thread on this site with suggestions of books to read which may help with Challenge route planning, background information on the area of the Highlands through which Challengers pass and other aspects of walking in remote country. With a hundred or so new Challengers each year I thought that this information may again be useful. Feel free to ignore it if you already know it all! Also if you have other suggestions (books that is) please feel free to add them.
Some are already in the notes to Challengers.
The Munros, Scottish Mountaineering Trust, ISBN 0 907521 13 4
The Corbetts and other Scottish Hills, Scottish Mountaineering Trust,
ISBN 0-907521-29-0.
Scottish Hill Tracks, Scottish Rights of Way Society, ISBN 0 9502811 8 2.
I’ll add,
Hamish’s Mountain Walk, Hamish Brown, ISBN 0 575 02362 7.
Climbing the Corbetts, Hamish Brown, ISBN 0-575-04378-4.
Classic Walks in Scotland, C. McNeish & R. Smith, ISBN 0-946609-51-9.
West Highland Walks vol 1, Hamish MacInnes, ISBN 0-340-35971-4.
West Highland Walks vol 3, Hamish MacInnes, ISBN 0 340 26912 X.
The Drove Roads of Scotland, A.R.B. Haldane, ISBN 1 874744 76 9.
Great Walks, Scotland, Brown, McOwan & Mearns, ISBN 0-7063-6749-9.
Exploring Scottish Hill Tracks, Ralph Storer, ISBN 0-71539806-7.
Mountaincraft & Leadership, Eric Langmuir, ISBN 1 85060 295 6.
First Aid Manual, ISBN 0-7513-0399-2.
Kidnapped, R.L.Stevenson.
Beyond Backpacking, Ray Jardine, ISBN 0-9632359-3-1.
Others have suggested the following:
Coast-to-coasting: John Gillham & Ronald Turnbull. ISBN 0 7153 0955 2.
Across Scotland on Foot: Ronald Turnbull. ISBN 0 9515 996 4 X.
Classic Walks: Ken Wilson & Richard Gilbert. ISBN 0 906371 11 2.
Wild Walks: Ken Wilson & Richard Gilbert. ISBN1 898573 20 4.
The Scottish Glens series -
Book 1 - The Cairngorm Glens ISBN 1-85284-086-2 
Book 2 - The Atholl Glens ISBN 1-85284-121-4
Book 3 - The Glens of Rannoch ISBN 1-85284-170-2
Book 4 - The Glens of Trossach ISBN 1-85284-199-0
Book 5 - The Glens of Argyll ISBN 1-85284-226-1
Book 6 - The Great Glen ISBN 1-85284-236-9
Book 7 - The Angus Glens ISBN 1-85284-248-2
Book 8 - Knoydart & Morvern ISBN 1-85284-282-2
Book 9 - The Glens of Ross-shire ISBN 1-85284-296-2.
The Central Highlands - 6 Long Distance Walks ISBN 1-85284-267-9
Seton Gordon Highways and Byways in the Central Highlands ISBN 1-874744-33-5
Hostile Habitats, Scottish Mountaineering Trust, ISBN 0 907521 93 2
Walking the watershed' from Dave Hewitt (ISBN0952268019)
Great British Ridge Walks, Bill Birkett( David Charles)
Exploring Scottish Hill Tracks. Ralph Storer isbn 0-7153-9806-7
"Scotland" by Chris Townsend: ISBN: 9781852844424
Irvine Butterfield's 'The High Mountains of Britain and Ireland, Vol. 1 The Munros and Tops and other 3,000ft Peaks' (ISBN 1-898573-63-8)
Ralph Storer:
Vol 1: Southern Highlands - ISBN 1-906307-57-1
Vol 2: Central Highlands South including Glen Coe - ISBN 1-906817-20-0
Vol 3: Central Highlands North including Ben Nevis - ISBN 1-906817-56-1
Plus more to come.

Peter,

You might include my book: 'A Walk From Cape Wrath to Edale'.

Much of the book is devoted to my Challenge crossing from Strathcarron to Arbroath as part of the overall 700-mile journey.

The Amazon Product Description gives a feeling:

'The author had long had a dream of a long walk – something to challenge him both mentally and physically. This book is his personal account of the realisation of that dream - a 700-mile backpacking trip from Cape Wrath in the far northwest of Scotland down to Edale in the centre of England. His route incorporated the 1999 Great Outdoors Challenge – an annual self-supporting coast-to-coast mountain expedition across Scotland sponsored by The Great Outdoors, a magazine for hillwalkers. It also took in The Pennine Way, and hence the chosen finish at Edale
The book describes his trials and tribulations, the problems that arose and the joys he found as the walk progressed. Whilst it is a serious and factual account, the narrative is optimistic and light-hearted, with anecdotes from the writer's hill and mountain experiences. It also offers helpful tips and advice for anyone contemplating undertaking such an adventure.
The book contains 24 maps, covering the whole route, and many photographs'.

The content covers my route planning and the factors I took into account.
The book is currently available only on Amazon Kindle. Interested parties can find it on Amazon by keying in: Ken Proudler Cape Wrath.

Ken

Done Ken, it will be included in the next up-date.

Hi there Mr. Grumpy. Things ok. on the hill then.
A very interesting book, not too well known is
" Burn On The Hill". The story of the first "Compleat Monroist"
Written by Elizabeth Allan 1995. An amazing account of one man's
round of the munroes in 1923.Acknowledged by the SMC. as the first
compleat munroist having scaled 558 tops over 3000ft..
Terrific historical photos of Highland places and people.
Even the Matheson family home at Lochivraon. Photos of many
of todays bothies when habited by workers and their families in
times gone by. Cheers

For Challengers passing through the Cairngorms, I would like to recommend the Kindle book "Lowdown on the Uplands of Mar" by Joe Dorward. The information in the book is also available on a website: http://theuplandofmar.squarespace.com/. Joe's writing gives us a fascinating insight into the people who lived and worked in the South Eastern Cairngorms and into the history of the paths and buildings they left behind. A free app is available that enables you to read Kindle books on your computer.

Thanks for the 2 suggestions. For next year I think that I shall divide the list into two sections. One dealing with routes and technical information and the second with general interest, history and geography. For me the history of an area is as interesting as the flora & fauna and scenery. Background information from these sources can help construct a more interesting walk than just picking a route from the map or walking guide book.

As an incidental aside on the history: aren't modern communications amazing?

Courtesy of the wonderful Phil Lambert, I've just been having an e-correspondence with a man in Western Australia who was evacuated to the tiny village of Salachill during World War II. An archaeology documentary on TV inspired him to google the name, and among other things he found Phil's doodlecat site, with my tale of my Ancient History Challenge route in 2011, and a couple of pics of Salachill. It was great to be able to send him a few more - although very sad that only ruins remain of what must have been a lovely place to live.

How the world is shrinking!
And thank you, Phil.

Bit extreme for Scotland, but at the moment Kindle has.

Home of The Blizzard by Sir Douglas Mawson available for free.
Yep, that's £0