I was in Thailand in 2001, and have the King Climbers Route Guidebook, 3rd Edition, by Somporn Suebhait. Contact info listed on the back of the book: King Climbers P.O. Box 34, Krabi 81000 Thailand. Email: kingclimbers@iname.com, Fax 66-75-612 914.
I picked up the guidebook when I got there. Had such a great time there, even named one of my dogs Krabi.