Region
North America
32
United States
6
California
4
Alaska
2
Idaho
2
Kansas
2
Missouri
2
Montana
2
Nevada
2
Pennsylvania
2
Wyoming
2
Atlantic Coast
1
Berkshire County
1
Connecticut
1
Hudson River Valley (N.Y. and N.J.)
1
Illinois
1
Lincoln County
1
Massachusetts
1
Minnesota
1
New Madrid
1
New York (State)
1
Oklahoma
1
Oregon
1
Pacific Coast
1
Preston
1
South Dakota
1
Texas
1
Utah
1
Virginia
1
Yukon
1