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1992. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Pennsylvania and Chester County.
1990. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey. English. Public. Pennsylvania and Chester County.
1932. 2013-03-15T13:32:13Z. 2013-03-15T13:32:13Z. Bascom, F. (Florence), 1862-1945. The Survey. English. Public. Pennsylvania, Chester County, Delaware County, Lancaster County, Delaware, New Castle County, États-Unis, and Pennsylvanie.
1909. 2013-03-14T16:47:42Z. 2013-03-14T16:47:42Z. The Survey. English. Public. Pennsylvania, Philadelphia, Chester County, Delaware County, Montgomery County, New Jersey, Camden County, Gloucester County, Delaware, and Newcastle County.