Region
Altoona (Pa.)
2
Elmira (N.Y.)
2
Greenwood Furnace State Park (Pa.)
2
Huntingdon County (Pa.)
2
Milroy (Pa.)
2
New Cumberland (Pa.)
2
Allegheny County (Pa.)--History
1
Cambria County (Pa.)--History
1
Cambria County (Pa.)--Maps
1
Crawford County (Pa.)--History
1
Dauphin County
1
Dauphin County (Pa.)
1
Erie County (Pa.)--History
1
Erie County (Pa.)--Maps
1
Germantown (Philadelphia, Pa.)
1
Indiana County (Pa.)--History
1
Indiana County (Pa.)--Maps
1
Pennsylvania
1