Region
Alaska
26
Nevada
5
Nebraska
3
New Mexico
3
United States
3
Alaska, Gulf of
2
Arizona
2
California
2
Colorado
2
Puerto Rico
2
Utah
2
Albuquerque
1
Amargosa River Valley (Nev. and Calif.)
1
Casa Grande Region
1
Fairbanks region
1
Hawaii
1
Howard County
1
Lake City Region
1
Las Vegas Valley
1
Meadow Valley Range Wilderness Region
1
Middle West
1
Montana
1
Northeastern States
1
Nye County
1
Red Willow County
1
Santa Fe Group
1
Southern States
1
Southwest, New
1
United States Virgin Islands
1
Virgin River Valley
1
West (U.S.)
1
Wyoming
1
Yucca Mountain
1