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1
Map of zones where land use can be affected by landsliding, flooding, and undermining, Allegheny County, Pennsylvania /
Reston, Virginia : Department of the Interior, United States Geological Survey, 1975

Government Document Mapa
2
Summary map of mined areas and areas of potential coal mining, southwestern Pennsylvania /
Reston, Va. : For sale by the U.S. Geological Survey, 1976

Government Document Mapa
3
Geologic map of the Bangor quadrangle, Pennsylvania-New Jersey /
Por Davis, Robert E., 1924-, Drake, Avery Ala, 1927-, Epstein, Jack Burton, 1935-
Washington, D.C. : U.S. Geological Survey, 1967

Government Document Mapa
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