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Author: Geological Survey (U.S.)
Author: Williams, Donald R.
Region: Pennsylvania
Language: English
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Geological Survey (U.S.)
Williams, Donald R.
2
Clark, Mary E. 1970-
1
Indiana County (Pa.). Commissioners
1
McElroy, Thomas A.
1
National Water-Quality Assessment Program (U.S.)
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1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Sams, James I.
1
Somerset Conservation District (Pa.)
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