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National geographic index, 1888-1988.

APA Citation

National Geographic Society (U.S.). (1989). National geographic index, 1888-1988. Washington, D.C.: National Geographic Society.

National Geographic Society (U.S.). National Geographic Index, 1888-1988. Washington, D.C.: National Geographic Society, 1989.

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