Region
United States
19
Pennsylvania
13
Philadelphia
9
Philadelphia (Pa.)
6
Chicago
4
Chicago (Ill.)
4
Foreign countries
4
Illinois
4
New York
4
New York (N.Y.)
4
New York (State)
4
California
3
Amérique du Nord
2
Canada
2
Colorado
2
Connecticut
2
Conservation of natural resources
2
Delta County
2
Environmental policy
2
Fremont County
2
Jersey City
2
Jersey City (N.J.)
2
Lander
2
Milwaukee
2
Milwaukee (Wis.)
2
New Jersey
2
New York County
2
New York County (N.Y.)
2
Paonia
2
Quebec (Province)
2
Québec (Province)
2
Russia
2
Saint-Régis (Indian reserve)
2
Saint-Régis (Réserve indienne)
2
Soviet Union
2
West (U.S.)
2
Wisconsin
2
Wyoming
2
Chapel Hill
1
Chapel Hill (N.C.)
1
Chester County
1
Chester County (Pa.)
1
Delaware
1
Los Angeles
1
Los Angeles (Calif.)
1
Los Angeles County
1
Los Angeles County (Calif.)
1
Maine
1
Milton
1
New York, NY
1
more ...