00918cam a2200253 4500 60618614 TxAuBib 20020110120000.0 800319s1980||||||||||||||||||||||||eng|u 80-7567 9780870443435 0870443437 TxAuBib Earle, Sylvia A., 1935- Exploring the Deep Frontier / by Sylvia A. Earle and Al Giddings ; prepared by the Special Publications Division, National Geographic Society, Washington, D.C. [Washington, D.C. : The Society, 1980. 296 p. : ill. ; 32 cm. Includes index. Bibliography: p. 285. 19980820. Underwater exploration. Deep diving. National Geographic Society (U.S.), Special Publications Division.