NSS
CAVERN DIVING MANUAL
John L. Zumrick, Jr., J. Joseph Prosser, and H.V. Grey
The
NSS Cavern Diving Manual is the work of many dedicated cavers who are sharing
their knowledge for the benefit of others who want to enjoy the sport. Contains
many fascinating and informative photographs and hand drawings contributed by
many members of this group. These photos and illustrations enrich the book, one
of the most comprehensive reports on cave diving.
Paperback: 121 pages