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by Thompson, James B.
[Washington, D.C.] : U.S. Department of the Interior, 1985
[Washington, D.C.] : U.S. Department of the Interior, 1985
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by Mattes, Merrill J.
Washington, D.C. : U.S. Department of the Interior, National Park Service, 1980
Washington, D.C. : U.S. Department of the Interior, National Park Service, 1980
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Government Document
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