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North America
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Edited by E.K. Tratman, by the members of the University of Bristol Spelaeological Society. A complete study in an area of 50 sq miles with all previous information included. Also the story of discovery, exploration, survey and investigation of 35 miles of very wet and dangerous caves over 17 years. 1969, 256pp, Fold out maps, illus. hb w/dj. |
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