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Wedow Helmuth 1917
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Wedow, Helmuth, 1917- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1975.
1975
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Ericksen, George Edward, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1970.
1970
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Wedow, Helmuth, 1917- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1967.
1967
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