Region
United States
93
Pennsylvania
35
Great Britain
14
Canada
10
England
10
France
9
Australia
8
New Jersey
7
Developing countries
6
Tropics
6
Africa
5
Easton (Northampton County)
5
New York (State)
5
California
4
Chester County (Pa.)
4
Philadelphia
4
Soviet Union
4
West (U.S.)
4
West Virginia
4
Arizona
3
Bethlehem
3
China
3
Europe
3
Florida
3
Germany
3
Illinois
3
Italy
3
Japan
3
Kansas
3
Kenya
3
Massachusetts
3
Middle East
3
New Mexico
3
New Zealand
3
North America
3
Northeastern States
3
Russia
3
Texas
3
Africa, North
2
Africa, West
2
America
2
Brazil
2
Bushkill Creek
2
Chester County
2
Colorado
2
Cuba
2
Indiana
2
Indonesia
2
Kentucky
2
London (England)
2
more ...