Author
United States. Bureau of Land Management
Geological Survey (U.S.)
19
National Science and Technology Center (U.S.)
11
National Operations Center (U.S.)
8
United States. Bureau of Land Management. New Mexico State Office
6
United States. Bureau of Land Management. Colorado State Office
5
United States. Bureau of Land Management. Montana State Office
3
United States. Bureau of Land Management. Wyoming State Office
3
United States. Bureau of Land Management. Oregon State Office
2