Maya: The Riddle And Rediscovery of a Lost Civilization (3rd Edition)
by Charles Gallenkamp
ISBN 13: 9780140088311
Format: Paperback (256 pages) Publisher: Penguin Published: 25 Feb 1988
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Dragon Hunter: Roy Chapman Andrews and the Central Asiatic Expeditions
by Charles Gallenkamp, Michael J. Novacek
ISBN 13: 9780142000762
Format: Paperback (368 pages) Publisher: Penguin Books Published: Apr 2002