Region
1837-1901
1
1918-1933
1
1933-1945
1
1945-
1
1945-1990
1
1953-1961
1
1958-
1
1974-
2
19th century
1
20th Century
1
7.150
1
Africa
10
Africa, East
1
Africa, North
2
Africa, Southern
1
Akita
1
Alabama
4
Alaska
3
Alaska Peninsula
1
Alaska Peninsula (Alaska)
1
Albany
2
Albany (N.Y.)
1
Aleutian Islands
1
Aleutian Islands (Alaska)
1
Algeria
1
Alliance
1
Alliance (Ohio)
1
Alton
3
America
6
Amherst
1
Andover
1
Andrews Air Force Base (Md.)
1
Ann Arbor (Mich.)
1
Appalachian Region
1
Arabian Peninsula
1
Arizona
5
Arlington
1
Armenia
1
Asia
1
Asia, Southeastern
1
Athos (Greece)
1
Atlanta
2
Australian
1
Azores
1
B United States
1
Baja California (Mexico : Peninsula)
3
Baja California (Peninsula)
4
Baltimore
9
Baltimore (Md.)
2
Bangladesh
1
more ...