Region
20th century
1
Accra
1
Accra (Ghana)
1
Addis Ababa
1
Afghanistan
1
Africa
18
Africa, Sub-Saharan
2
Africa, West
2
Agate Dam (Or.)
1
Agawam
1
Agency Lake
2
Agency Lake (Or.)
1
Alabama
3
Alachua County
1
Alaska
38
Alaska, Gulf of
1
Alaska, Gulf of (Alaska)
1
Albany
1
Alberta
5
Albuquerque
1
Alexander Archipelago (Alaska)
1
Alsea River Estuary
1
Alsea River Watershed
2
Alvord Desert Wilderness
1
Alvord Desert Wilderness (Or.)
1
Amazon Creek
1
Amazon Creek (Or.)
1
Amazon Creek Watershed
1
America
13
American Samoa
1
Amherst
2
Anacortes
1
Anchorage
1
Anderson
1
Antarctica
2
Antilles, Greater
1
Antiquities
1
Applegate Trail
1
Arab countries
2
Arabian Peninsula
1
Argentina
1
Arizona
11
Arkansas
5
Arlington (Or.)
1
Armenia
2
Ashland
1
Ashland (Or.)
1
Ashland Region
2
Asia
6
Asia, Central
1
more ...