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Mysteries of mankind :
Earth's unexplained landmarks /
prepared by the Book Division, National Geographic Society.

APA Citation

National Geographic Society (U.S.). Book Division. (1992). Mysteries of mankind: Earth's unexplained landmarks. Washington, D.C.: The Society.

MLA Citation

National Geographic Society (U.S.). Book Division. Mysteries of Mankind: Earth's Unexplained Landmarks. Washington, D.C.: The Society, 1992.

Warning: These citations may not always be complete (especially for serials).