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 from 1973, 1:12,000 scale aerial photographs verified by field reconnaissance in 1973 and 1974. Supplementary interpretations relative to surface subsidence were done using 1939 aerial photographs.
Additional publication details
|Publication Subtype||USGS Numbered Series|
|Title||Map of coal-mining features, Allegheny County, Pennsylvania|
|Series title||Miscellaneous Field Studies Map|
|Publisher||U.S. Geological Survey|
|Description||2 Sheets: 32.14 x 36.20 inches and 35.77 x 44.78 inches|