Region
North America
29
United States
4
California
3
Alaska
2
Kansas
2
Montana
2
Nevada
2
Atlantic Coast
1
Berkshire County
1
Connecticut
1
Idaho
1
Illinois
1
Lincoln County
1
Massachusetts
1
Minnesota
1
Missouri
1
New Madrid
1
New York (State)
1
Oklahoma
1
Oregon
1
Pennsylvania
1
Preston
1
South Dakota
1
Texas
1
Virginia
1
Wyoming
1
Yukon
1