1980. 2002-06-01T04:00:00Z. 2021-09-28T13:19:42Z. U.S. Fish and Wildlife Service ; [Dept. of the] Interior, Geological Survey : For sale by the U.S. Geological Survey. English. Public. Maryland, Virginia, Pennsylvania, and Atlantic Coast (U.S.).
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1980. 2002-06-01T04:00:00Z. 2021-02-15T21:08:18Z. U.S. Fish and Wildlife Service ; [Dept. of the] Interior, Geological Survey : For sale by the U.S. Geological Survey. English. Public. New Jersey, New York (State), Pennsylvania, and Atlantic Coast (U.S.).
1980. 2002-06-01T04:00:00Z. 2021-09-27T17:27:30Z. U.S. Fish and Wildlife Service ; [Dept. of the] Interior, Geological Survey : For sale by the U.S. Geological Survey. English. Public. Delaware, New Jersey, Maryland, Pennsylvania, and Atlantic Coast (U.S.).
1980. 2012-10-22T13:34:45Z. 2012-10-22T13:34:45Z. Pennsylvania. Bureau of Topographic and Geologic Survey. The Survey. English. Public. Pennsylvania.
1980. 2015-05-05T19:25:05Z. 2015-05-19T22:10:49Z. Wray, James R. Dept. of the Interior, U.S. Geological Survey. English. cartographic image. Public. Pennsylvania, Pittsburgh Region, Pittsburgh Region (Pa.), and Pittsburgh Metropolitan Area (Pa.).