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1Published 1900“...The Survey ;...”
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2Published 1987“...The Survey,...”
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3Published 1990“...The Survey ;...”
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4Published 1990“...The Survey ;...”
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10Published 1990“...U.S. Geological Survey ;...”
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11Published 1993“...U.S. Geological Survey ;...”
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14by De Witt, Wallace, Jr., 1920-2012“...U.S. Geological Survey,...”
Published 1974
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16by Patterson, E. D. (Elmer Davisson)“...U.S. Geological Survey,...”
Published 1972
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19by Shuster, Evan T.“...Commonwealth of Pa., Dept. of Environmental Resources, Topographic and Geologic Survey :...”
Published 1979
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