For Sale, NSS published hardcover book, "On Station," George R. Dasher, 1994, 242 pages. The comprehensive guide to everything about cave mapping and survey. This book is in nearly new condition, including dust jacket, 9.5 out of 10 condition (previous owner's name marked out on each spine.) Lots of great diagrams, maps, etc. A must for any caver's complete library.
Only $12.50, which is 50% off the NSS Bookstore price, plus FREE SHIPPING! Reply here/PM me if you want it.