Region
Pennsylvania
Berks County
4
Berks County (Pa.)
3
Hopewell Furnace National Historic Site (Pa.)
2
Berks (Comté)
1
Birdsborough (Berks County, Pa.)
1
Hawk Mountain Sanctuary
1
Hawk Mountain Sanctuary (Pa.)
1
Hopewell Furnace National Historic Site
1
Hopewell Furnace National Historic Site (Penns.)
1
Pennsylvanie
1