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U.S.\@ Army Map Service. "Computer production of terrain models." Communications of the Association for Computing Machinery 6 (1963): 190-191.
Udvardy, Miklos D.. A classification of the biogeographical provinces of the world In IUCN Occasional Paper. Vol. 18. Morges, Switzerland: International Union of Conservation of Nature and Natural Resources, 1975.
Unit Geo Software Development. ILWIS 3.0 Academic user's guide. Enschede: International Institute for Geo-Information Science and Earth Observation (ITC), 2001.