Place
Colorado
15
United States
8
New Mexico
5
Nova Scotia
4
Australia
2
California
2
China
2
Manitoba
2
San Juan Basin
2
Texas
2
UTAH
2
Africa
1
Alberta
1
Canada
1
Europe
1
France
1
Germany
1
Greenland
1
Halifax
1
Iceland
1
Inverness County
1
Iran
1
Iraq
1
Israƫl
1
Louisiana
1
Maine
1
Maritime Provinces
1
Massachusetts
1
Michigan
1
Middle East
1
Mississippi
1
Montana
1
North Carolina
1
North Dakota
1
Norway
1
Oklahoma
1
Saskatchewan
1
South America
1
South Dakota
1
Spain
1
Wyoming
1