Subject Region
United States
96
Pennsylvania
34
Europe
33
Mexico
25
Spain
25
Great Britain
22
European Union countries
21
Espana
19
Québec (Province)
16
China
14
Lehigh River Valley
14
Brazil
13
Colombia
13
Latin America
13
Canada
12
France
11
California
9
Europe, Central
9
Developing countries
8
Europe, Eastern
8
Africa
7
England
7
Germany
7
Australia
6
India
6
New York (State)
6
Delaware Water Gap National Recreation Area (N.J. and Pa.)
5
Lehigh County
5
Netherlands
5
New Jersey
5
New York
5
North America
5
Northampton County
5
Russia (Federation)
5
Delaware River Valley (N.Y.-Del. and N.J.)
4
Italy
4
New Zealand
4
North Carolina
4
Ontario
4
America Latina
3
Appalachian Region
3
Argentina
3
Caribbean Area
3
Catalonia
3
Chile
3
Florida
3
Indonesia
3
Japan
3
Los Angeles
3
Los Angeles Metropolitan Area
3
more ...