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1850 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
1850'S Pennsylvania Maps - mapsofpa.com
Maps | Commonwealth of Pennsylvania - Pennsylvania Historical …
Pennsylvania County Creation Dates and Parent Counties
Pennsylvania Early County Map List - mapsofpa.com
Historic Maps - Maps & Geospatial: Pennsylvania Maps - Library …
[Maps of Pennsylvania, from 1850-1859]. | Library of Congress
19th Century Pennsylvania Maps - mapsofpa.com