Region
United States
3
Africa
1
Alcatraz Island (Calif.)
1
Australia
1
California, Southern
1
Cameroon
1
Chicago (Ill.)
1
Earth (Planet)
1
Florida
1
Great Britain
1
Krakatoa (Indonesia)
1
London (England)
1
Mars (Planet)
1
New York (N.Y.)
1
Norvelt (Pa.)
1
Norway
1
Pennsylvania
1
Pittsburgh (Pa.)
1
Sweden
1
Vermont
1
Wisconsin
1