Não informado. (1982). National Water Conditions. U.S. Department of the Interior, Geological Survey.
Citace podle Chicago (17th ed.)Não informado. National Water Conditions. Reston, Va: U.S. Department of the Interior, Geological Survey, 1982.
Citace podle MLA (8th ed.)Não informado. National Water Conditions. U.S. Department of the Interior, Geological Survey, 1982.
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