"NSS Cavern Diving Manual" by John L. Zumrick, Jr., J. Joseph Prosser, H. V. Grey
with illustrations by Wayne McKinnon, H. V. Grey
The Cave Diving Section, National Speleological society, Inc | 1988 | n/a | 128 pages | PDF | 5 Mb
This book is one of the most comprehensive reports on cave diving and will serve as a thorough reference work on the basics of cavern diving.