Region
United States
54
Great Britain
10
Europe
3
Soviet Union
3
Japan
2
20th century
1
Brazil
1
British Columbia
1
California
1
Communist countries
1
Earth (Planet)
1
Egypt
1
France
1
Germany
1
Grande-Bretagne
1
Greece
1
Ireland
1
Korea (South)
1
Louisiana
1
Manchuria (China)
1
Mexican-American Border Region
1
Mississippi River Valley
1
New England
1
Northwest, Pacific
1
Rio Grande do Sul
1
Rio Grande do Sul (Brazil)
1
Santa Clara Valley (Santa Clara County)
1
Santa Clara Valley (Santa Clara County, Calif.)
1
Silicon Valley
1
Solar system
1
Switzerland
1
Western countries
1
États-Unis
1