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Map of coal-mining features, Allegheny County, Pennsylvania
W.E. Davies, J. S. Pomeroy, W. R. Kohl
1976, Miscellaneous Field Studies Map 685-C
This map is one result of a series of studies sponsored by the Appalachian Regional Commission as part of a larger U.S. Geological Survey program of environmental analysis of a part of southwestern Pennsylvania. The map summarizes surface features resulting from coal mining. The distribution of surface features is largely...