Region
Alaska
2
Arizona
3
Canada
5
Charlotte
1
China
8
Connecticut
1
Developing countries
1
Etats-Unis
1
Europe
2
Former Soviet republics
1
France
2
Grande-Bretagne
1
Great Britain
9
India
1
Israel
1
Japan
11
Kentucky
1
Korea (South)
1
Laredo
2
Maryland
1
Massachusetts
1
Mexican-American Border Region
2
Mexico
1
Mexico, Gulf of
3
Michigan
3
Missouri
1
New Hampshire
2
New Jersey
1
New York (State)
1
New York Metropolitan Area
1
North America
1
North Carolina
1
Northern boundary of the United States
1
Ohio
1
Outer space
7
Russia (Federation)
3
Soviet Union
1
Technological innovations
2
Texas
2
Tinker Air Force Base (Okla.)
2
Two Rivers (Wis.)
1
UNITED STATES
1
United States
1,991
United States States
1
Washington (State)
1
Western Front
2