Region
Pennsylvania
27
Philadelphia
4
United States
3
Clearfield County
2
Elk County
2
Pittsburgh (Pa.)
2
Allegheny Mountains
1
Berks County
1
Berks County (Pa.)
1
Chester County
1
Conemaugh Valley
1
East (U.S.)
1
Hummelstown
1
Jefferson County
1
New Bedford
1
New Jersey
1
New York (État)
1
New York (State)
1
Ohio
1
Pennsylvanie
1
Pittsburgh
1
Point State Park (Pittsburgh, Pa.)
1
Schuylkill Canal (Pa.)
1
Somerset County
1
Texas
1
Virginia
1