The beginnings of the petroleum industry, sources and bibliography
A checklist of Pennsylvania newspapers
Guide to the manuscript collections in the Historical society of ...
Inventory of the county archives of Pennsylvania, Fayette County
Inventory of the county archives of Pennsylvania : Lancaster County, ...
Inventory of the county archives of Pennsylvania: Lehigh County
A partial bibliography of the archaeology of Pennsylvania and adjacent ...
Pennsylvania history and morale
Pennsylvania's first year at war, December 7, 1941-December 7, 1942
Remember William Penn, 1644-1944