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4
Geological Survey (U.S.)
4
National Operations Center (U.S.)
4
United States. Bureau of Land Management
4
United States. Bureau of Land Management. Wyoming State Office
3
Christiansen, Robert L.
3
Prostka, Harold J.
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3
Richmond, Gerald Martin, 1914-
2
Blank, H. Richard 1929-
2
Pierce, Kenneth L.
1
Ruppel, Edward Thompson, 1925-
1
Smedes, Harry W. 1926-
1
United States. National Park Service,
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