Region
Pennsylvania
28
Berks County
8
Penn
8
Berks County (Pa.)
7
Hopewell Furnace National Historic Site (Pa.)
6
Bucks Co
3
Chester County (Pa.)
3
Durham
3
New Jersey
3
Altoona (Pa.)
2
Cornwall
2
Elmira (N.Y.)
2
Greenwood Furnace State Park (Pa.)
2
Huntingdon County (Pa.)
2
Milroy (Pa.)
2
New Cumberland (Pa.)
2
Pennsylvanie
2
Robesonia (Pa.)
2
Allentown
1
Allentown (Pa.)
1
Berks (Comté)
1
Birdsboro
1
Birdsboro (Pa.)
1
Chesapeake and Delaware Canal (Del. and Md.)
1
Chester Co
1
Chester County
1
Cornwall (Pa.)
1
Elkton
1
Elkton (Md.)
1
Governor Printz Park
1
Hocking County (Ohio)
1
Hopewell Furnace
1
Hopewell Furnace National Historic Site
1
Hopewell Furnace National Historic Site (Penns.)
1
Hopewell Village (Birdsboro, Pa.)
1
Iron industry and trade
1
Lancaster Co
1
Lehigh County (Pa.)
1
Lime Ridge (Lower Saucon Township, Northampton County, Pa.)
1
Lower Saucon (Pa. : Township)
1
Lower Saucon (Township)
1
Maryland
1
Montgomery County
1
Montgomery County (Pa.)
1
Northampton County (Pa.)
1
Old Economy (Pa.)
1
Pine Grove Furnace (Pa.)
1
Pine Grove Iron Works
1
Reading Furnace Farm (Pa.)
1
Redington (Lower Saucon Township, Northampton County, Pa.)
1
more ...