00807cam a2200229 4500 153183512 TxAuBib 19931015120000.0 930716s1993||||||||||||||||||||||||eng|u 93027590 (OCoLC)28548257 DLC DLC DLC TxAuBib Unlocking secrets of the unknown with National Geographic / prepared by the Book Division, National Geographic Society. Washington, D.C. : The Society, 1993. 200 p. : ill. (some col.) ; 27 cm. Includes index. 20040412. National Geographic Society (U.S.) Geography Research. National Geographic Society (U.S.), Book Division. TXJOU