Region
18th century
1
Aaronsburg
1
Aaronsburg (Pa.)
1
Abington (Montgomery County : Township)
1
Adams County
5
Adams County (Pa.)
1
Africa
5
Africa, North
3
Africa, Sub-Saharan
1
Alabama
3
Alaska
2
Alaska Maritime National Wildlife Refuge (Alaska)
1
Aldred, Lake (Pa.)
1
Algeria
3
Allegheny Co
2
Allegheny County
16
Allegheny County (Pa.)
11
Allegheny Mountains
1
Allegheny National Forest
10
Allegheny National Forest (Pa.)
4
Allegheny Plateau
2
Allegheny Portage Railroad National Historic Site
2
Allegheny Portage Railroad National Historic Site (Pa.)
4
Allegheny River Valley (Pa. and N.Y.)
3
Allentown
3
Allentown (Pa.)
1
Ambler
1
America
38
Amish Country (Pa.)
2
Appalachian Basin
2
Appalachian Region
5
Arizona
3
Arkansas
2
Armstrong County
1
Ashland
1
Ashland (Pa.)
1
Asia
1
Atlanta
1
Atlantic Coast (Middle Atlantic States)
3
Atlantic Ocean
1
Atlantic States
1
Augusta County (Va.)
2
Austria
2
Bald Eagle Creek
1
Bald Eagle Creek Watershed (Blair County-Clinton County)
1
Baltimore
15
Baltimore (Md.)
3
Bangladesh
1
Barbados
2
Bari (Italy : Province)
1
more ...