Historic County Maps of PA
Some will show only roads but some will show houses. I think every county in pa is listed.
http://www.dot.state.pa.us/Internet/Bureaus/pdPlanRes.nsf/infoBPRHistoricCountyMaps
Some will show only roads but some will show houses. I think every county in pa is listed.
http://www.dot.state.pa.us/Internet/Bureaus/pdPlanRes.nsf/infoBPRHistoricCountyMaps