Region
20th century
1
Abū Ẓaby (Emirate)
1
Accra (Ghana)
1
Adriatic Sea Region
1
Aegean Sea Region
1
Africa
40
Africa, East
1
Africa, North
3
Africa, Southern
1
Africa, Sub-Saharan
1
Ahmadābād (India)
1
Alaska
4
Alberta
1
Albuquerque
1
Andes Region
2
Andhra Pradesh
1
Arab countries
3
Arctic regions
1
Argentina
2
Arizona
3
Armenia
1
Asia
38
Asia, Central
1
Assyria
1
Atlantic Ocean Region
1
Australia
13
BRIC countries
2
Bangladesh
1
Barcelona
1
Bavaria
1
Beijing (China)
1
Belgium
2
Benelux countries
1
Benin
1
Binhai Xinqu (Tianjin, China)
3
Boston
1
Brazil
14
British Columbia
2
Brooklyn Bridge (New York, N.Y.)
1
Brussels
1
Brussels (Belgium)
1
California
12
Cambodia
1
Cameroon
1
Canada
34
Canada, Western
1
Caribbean Area
3
Change (Psychology)
2
Charlotte
1
Chesapeake Bay Watershed
1
more ...