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1800 Historical Pennsylvania Counties Map – shown on Google Maps
Pennsylvania Early County Maps and Atlases - Sites at Penn State
PA State Archives - MG-11 - County Maps - Main Interface
1800's Pennsylvania Maps - mapsofpa.com
Pennsylvania County Creation Dates and Parent Counties
Maps | Commonwealth of Pennsylvania - Pennsylvania Historical …
State & County Maps of Pennsylvania - MapGeeks
Historic Maps - Maps & Geospatial: Pennsylvania Maps - Library …
Organization of Counties in Pennsylvania
Pages | Pennsylvania | Atlas of Historical County Boundaries Project