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1by Moxham, Robert Morgan, 1919-“...Geological Survey circular ;...”
Published 1954
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2
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3by Applin, Paul L. (Paul Livingston)“...Geological Survey circular ;...”
Published 1951
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4
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7by Verdi, Richard Jay“...U.S. Geological Survey circular ;...”
Published 2006
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10by Berndt, Marian P.“...U.S. Geological Survey circular ;...”
Published 1998
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11
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12by Schiffer, Donna M.“...U.S. Geological Survey circular ;...”
Published 1998
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13by Frick, Elizabeth A.“...U.S. Geological Survey circular ;...”
Published 1998
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