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1
by Schweinfurth, Stanley P.
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1971
Harrisburg : Commonwealth of Pennsylvania, Bureau of Topographic and Geologic Survey, 1971
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2
[Harrisburg, Pennsylvania] : [Published by the Board of Commissioners for the Second Geological Survey], 1875
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by Rockwell, Barnaby W. (Barnaby Whitson)
Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey, 2012
Reston, VA : U.S. Dept. of the Interior, U.S. Geological Survey, 2012
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12
by Sainsbury, C. L. (Cleo Ladell), 1921-, Hudson, Travis, 1946-, Kachadoorian, Reuben, 1921-, Richards, Thomas
Washington, D.C. : U.S. Govt. Print. Off., 1970
Washington, D.C. : U.S. Govt. Print. Off., 1970
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13
by Bryson, Robert P., 1911-
[Washington D.C. ] : U.S. Geological Survey, 1973
[Washington D.C. ] : U.S. Geological Survey, 1973
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14
by Bernstein, Rachel, 1984-
Reston, Va. : U.S. Geological Survey, 2006
Reston, Va. : U.S. Geological Survey, 2006
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15
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by Moffit, Fred H. (Fred Howard), 1874-1958?
Washington : Govt. Print. Off., 1909
Washington : Govt. Print. Off., 1909
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by Pearson, Robert Carl, 1926-
[Washington D.C. ] : U.S. Geological Survey, 1971
[Washington D.C. ] : U.S. Geological Survey, 1971
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20
Reston, VA : U.S. Geological Survey, 2006
Version 1.0.
Version 1.0.
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