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1884. 2012-03-14T13:31:17Z. 2012-07-11T15:16:56Z. Geological Survey of Pennsylvania. Second Geological Survey of Pennsylvania. English. Public. Pennsylvania, Carbon County, Columbia County, Northumberland County, and Schuylkill County.

10. Nomini folio, Maryland-Virginia

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1896. 2013-03-13T15:21:49Z. 2021-09-28T16:52:34Z. Darton, Nelson Horatio, 1865-1948. Engraved and printed by the U.S. Geological Survey, Bailey Willis, Editor of Geologic Maps, S.J. Kübel, Chief Engraver. English. Public. Maryland, Calvert County, Charles County, Saint Mary's County, Virginia, Essex County, Northumberland County, Richmond County, and Westmoreland County.