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Washington, D.C. : National Geographic Society, 1993.
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Subject
Desertification—Maps
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Place
Earth
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1. Endangered earth
National Geographic Society (U.S.). Cartographic Division. Includes tex and chronological chart. Includes text, ancillary maps of "Ice age vegetation 18,000 years BP" and "Greenhouse-effect vegetation zones... Washington, D.C. : National Geographic Society, 1993.