00835cam a2200253 4500 60617988 TxAuBib 20020117120000.0 920611s1992||||||||||||||||||||||||eng|u 92022242 9780870448645 0870448641 TxAuBib National Geographic Book Service. Mysteries of Mankind / prepared by the Book Division, National Geographic Society. Washington, D.C. : The Society, 1992. 200 p. : photos, col. Includes index. 19981003. Megalithic monuments. Earthworks (Archaeology). Sacred space. National Geographic Society (U.S.), Book Division.