00818cam a2200241 4500 153183806 TxAuBib 19921007120000.0 920611s1992||||||||||||||||||||||||eng|u 9780870448645 0870448641 (OCoLC)26158313 DLC DLC DLC TxAuBib Mysteries of mankind : Earth's unexplained landmarks / prepared by the Book Division, National Geographic Society. Washington, D.C. : The Society, 1992. 200 p. : col. ill. ; 26 cm. 20040412. Megalithic monuments. Earthworks (Archaeology.) Sacred space. National Geographic Society (U.S.), Book Division. TXJOU