Region
Pennsylvania
74
Chester County
7
Berks County
6
United States
5
Berks County (Pa.)
4
Chester County (Pa.)
4
Lancaster County
4
Pennsylvanie
4
Philadelphia
4
Montgomery County
3
Valley Forge
3
Valley Forge (Pa.)
3
Cornwall
2
Elkton (Md.)
2
Maryland
2
Perkiomen River and Valley
2
Perkiomen River and Valley (Pa.)
2
Pittsburgh
2
Robesonia
2
Scranton (Pa.)
2
Berks Co
1
Birdsborough (Berks County, Pa.)
1
Blair County
1
Blair County (Pa.)
1
Chesapeake and Delaware Canal (Del. and Md.)
1
Chester (Comté)
1
Cornwall (Pa.)
1
Coventry
1
Coventry (Pa.)
1
Elk Forge
1
Elkton
1
États-Unis
1
Hopewell Furnace National Historic Site (Pa.)
1
Hopewell Village National Historic Site
1
Johnstown
1
Johnstown (Cambria County, Pa.)
1
Lancaster County (Pa.)
1
Montgomery County (Pa.)
1
Pennsy
1
Philad
1
Philadelphi
1
Pine Grove Furnace (Pa.)
1
Pine Grove Iron Works
1
Pitt
1
Pittsburg
1
Reading
1
Reading Furnace Farm (Pa.)
1
Robesonia (Pa.)
1
Scranton
1
South Bethlehem
1