Region
United States
24
Colorado
3
France
2
Japan
2
Marcellus Shale
2
New York
2
New York (State)
2
Andes Region
1
Appalachian Region, Southern
1
Argentina
1
Burgundy
1
California
1
Champagne-Ardenne
1
Champagne-Ardenne (France)
1
England
1
Florence
1
Front Range (Colo. and Wyo.)
1
Germany
1
Jefferson County
1
Kenya
1
Montrose County
1
Montrose County (Colo.)
1
Moon
1
North Dakota
1
Texas
1
Uruguay
1
Walt Disney World (Fla.)
1