Geological Survey (U.S.)
Denver, CO (12795 W. Alameda Pkwy., Denver 80225-0287) : U.S. Dept. of the Interior, National Park Service, Denver Service Center, [1997]
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Narumalani, Sunil G. (Sunil Gehimal), 1958- author.
Fort Collins, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, 2010.
2010