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Pecora W T William Thomas 1913 1972
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Schmidt, Robert George, author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1964.
1964
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Schmidt, Robert G. (Robert Georges), 1923- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1961.
1961
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Bryant, Bruce, 1930- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1960.
1960
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Hearn, B. C., author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1964.
1964
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Pecora, W. T. (William Thomas), 1913-1972, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1950.
1950
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Pecora, W. T. (William Thomas), 1913-1972, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1942.
1942
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Pecora, W. T. (William Thomas), 1913-1972, author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1944.
1944
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