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Denver, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, 2011.
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Sullivan, Timothy J. (Timothy Joseph), 1950- author.
Denver, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, 2011.
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Struthers, Kimberly, author.
Fort Collins, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Stewardship and Science, 2014.
2014
De Vore, Steven Leroy, author.
Lincoln, Nebraska : United States Department of the Interior, National Park Service, Midwest Archeological Center, 2012.
2012