Region
North America
33
United States
6
California
5
Alaska
3
Nevada
3
Kansas
2
Minnesota
2
Montana
2
New York (State)
2
Pennsylvania
2
Texas
2
Alabama
1
America
1
Atlantic Coast
1
Berkshire County
1
Colorado
1
Connecticut
1
Elliott County
1
Idaho
1
Illinois
1
Kentucky
1
Lincoln County
1
Maine
1
Massachusetts
1
Missouri
1
Mono Lake
1
New Madrid
1
New Mexico
1
North Dakota
1
Oklahoma
1
Oregon
1
Preston
1
Purgatory Canon
1
South Dakota
1
Utah
1
Virginia
1
Washington (State)
1
West (U.S.)
1
Wyoming
1
Yukon
1