Lane Larson and Peggy Larson, SB, 311pp, Sierra Club Books (1982)

There are over 20,000 known caves in the United States alone. Two experienced cavers offer a comprehensive introduction to the unuqie wilderness activity of caving, explaining how caves are formed, cave ecosystems, and the fascinating, often beautiful natural formations to be found there. The full panoply of caving gear is described, and caving techniques (many borrowed from mountaineering) are thoroughly illustrated. Later chapters cover such specialized skills as underwater cave diving and ice caving.