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18
Geological Survey (U.S.)
8
Richmond, Gerald Martin, 1914-
5
Pierce, Kenneth L.
4
National Operations Center (U.S.)
4
United States. Bureau of Land Management
4
United States. Bureau of Land Management. Wyoming State Office
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3
Waldrop, Henry A.
2
United States. National Park Service,
1
Richmond, G. L.
1
Yellowstone National Park (Agency : U.S.),
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