Region
North America
4
Amérique du Nord
2
Ohio River
2
Pennsylvania
2
Atlantic Ocean
1
Australia
1
Chesapeake Bay
1
Chesapeake Bay (Md. and Va.)
1
Italy
1
Middle Atlantic States
1
Northeastern States
1
Penn
1
Philadelphia
1
Sicily
1
Susquehanna River Watershed
1
Torresdale (Philadelphia, Pa.)
1
United States
1
Victoria
1