Region
Africa, North
1
Africa, Sub-Saharan
1
Africa, West
4
Alaska
4
Appalachian Region
1
Appalachian region
1
Arctic National Wildlife Refuge
1
Arizona
1
Arkansas
1
Brazil
2
California
12
Canada
4
Caribbean Area
2
Caspian Sea Region
2
China
6
Colorado
1
Connecticut
1
Developing countries
3
Economic conditions
1
Energy policy
1
Eurasia
2
Europe
3
Europe, Western
3
France
1
Great Britain
1
Guinea, Gulf of
3
India
1
Iran
6
Iraq
10
Japan
3
Kotzebue (Alaska)
1
Latin America
4
Louisiana
1
Mexico
1
Mexico, Gulf of
1
Middle East
6
Middle West
2
Minnesota
1
Mississippi
2
Montana
1
Nevada
1
New England
2
New Hampshire
1
New Jersey
1
New Mexico
1
New York (State)
3
North America
3
Northeastern States
4
Northwest, Pacific
1
Pacific Area
2
more ...