Region
Pennsylvania
Chester County
7
Schuylkill County
7
Philadelphia
6
Lancaster County
5
United States
5
Berks County
4
Bucks County
4
Maryland
4
New Jersey
4
Lehigh County
3
Montgomery County
3
Pittsburgh
3
Allegheny National Forest
2
Allegheny National Forest (Pa.)
2
Conestoga River Watershed
2
Delaware County
2
Erie County
2
Lansdale
2
New York (State)
2
Northampton County
2
Northumberland County
2
Somerset County
2
Warren County
2
Adams County
1
Appalachian Mountains
1
Cambria County
1
Carbon County
1
Carroll Valley
1
Centre County
1
Chickies Quartzite
1
Clearfield County
1
Clinton County
1
Colmar Region
1
Columbia County
1
Conestoga River
1
Cumberland Valley (Md. and Pa.)
1
Elverson
1
Fayette County
1
French Creek Watershed (Berks County and Chester County)
1
Hatboro
1
Juniata River Region
1
Lebanon County
1
Malvern
1
Media
1
Monroe County
1
Morgantown
1
Neshaminy Creek Watershed
1
Newville Region (Cumberland County)
1
Norristown
1
more ...