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1by Nelson, Willis H. (Willis Howard), 1920-2010“...U.S. Geological Survey bulletin ;...”
Published 1990
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3by Nelson, Willis H. (Willis Howard), 1920-2010“...Geological Survey bulletin ;...”
Published 1968
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4by Powers, Howard A., Coats, Robert R. (Robert Roy), 1910-1995, Nelson, Willis H. (Willis Howard), 1920-2010“...Geological Survey bulletin ;...”
Published 1960
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5by Lewis, Richard Quintin, 1919-, Nelson, Willis H. (Willis Howard), 1920-2010, Powers, Howard A.“...Geological Survey bulletin ;...”
Published 1960
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6by Nelson, Willis H. (Willis Howard), 1920-2010“...Geological Survey bulletin ;...”
Published 1959
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7
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8by Nelson, Willis H. (Willis Howard), 1920-2010“...Geological Survey bulletin ;...”
Published 1963
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9by Nelson, Willis H. (Willis Howard), 1920-2010, Ross, Clyde P. (Clyde Polhemus), 1891-1965“...Geological Survey bulletin ;...”
Published 1968
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10by Nelson, Willis H. (Willis Howard), 1920-2010“...Geological Survey bulletin ;...”
Published 1980
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11by Nelson, Willis H. (Willis Howard), 1920-2010, Prostka, Harold J., Williams, Frank E.“...Geological Survey bulletin ;...”
Published 1980
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