Author
Natural Resource Program Center (U.S.),
3
Colorado Natural Heritage Program
2
Echevarria, Susana,
2
Sullivan, Timothy J. 1950-
2
United States. National Park Service
2
United States. National Park Service,
2
United States. National Park Service. Denver Service Center
2
Geological Survey (U.S.)
1
Gionfriddo, James Paul
1
Hafen, LeRoy R. 1893-1985
1
Hunt, Roy V., 1914-1986
1
Kettler, Steve
1
Miller, Harry
1
State Historical Society of Colorado
1
State Historical Society of Colorado,
1
Stevens, Joe
1
Thompson, Enid T.,
1
United States. Bureau of Land Management
1
University of Colorado (Boulder campus). Museum
1
Vana-Miller, David,
1