Region
Pennsylvania
321
United States
220
Ohio River Valley
190
Mississippi River Valley
160
Delaware River Valley (N.Y.-Del. and N.J.)
141
Philadelphia
140
Delaware River (N.Y.-Del. and N.J.)
99
New Jersey
91
Mississippi River
85
Delaware River
75
Ohio River
56
Susquehanna River
55
New York (State)
54
Penn
46
Schuylkill River
46
Schuylkill River (Pa.)
45
Virginia
45
Delaware
43
Northwest, Old
38
Susquehanna River Valley
37
Shenandoah River Valley (Va. and W. Va.)
36
North America
35
Philadelphia (Pa.)
35
Hudson River Valley (N.Y. and N.J.)
34
Ohio
31
Canada
28
États-Unis
28
Louisiana
28
West (U.S.)
27
West Virginia
23
Lehigh River Valley
22
Missouri River
22
Delaware River Estuary
20
Maryland
20
Minnesota
20
Mohawk River Valley (N.Y.)
20
Delaware River Valley
19
Northwestern States
19
America
18
Delaware River Watershed (N.Y.-Del. and N.J.)
18
Lehigh River Valley (Pa.)
18
Mississippi, Vallée du
18
Kentucky
16
Ohio, Vallée de l'
16
Columbia River
15
Hudson River
15
New France
15
Hudson River (N.Y. and N.J.)
14
Saint Lawrence River
14
New Sweden
13
more ...