Lenart, Melanie. 2003. ?A Comparative Study Of Soil Disturbance From Uprooted Trees, And Mound And Pit Decay In Puerto Rico And Colorado?. Institute For The Study Of Planet Earth. Institute For The Study Of Planet Earth. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=765017541&sid=9&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Margolis, Ellis Quinn. 2003. ?Stand Replacing Fire History And Aspen Ecology In The Upper Rio Grande Basin?. Department Of Renewable Natural Resources. Department Of Renewable Natural Resources. Tucson: University of Arizona.

Ryerson, Daniel E. 1999. ?Tree-Ring Reconstruction Of Western Spruce Budworm Outbreaks In The Rio Grande National Forest, Colorado?. School Of Renewable Natural Resources. School Of Renewable Natural Resources. Tucson: University of Arizona.

Varien, Mark. 1997. ?New Perspectives On Settlement Patterns: Sedentism And Mobility In A Social Landscape?. Anthropology. Anthropology. Arizona State University. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=739774541&sid=19&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Dean, Jeffrey S. 1975. Tree-Ring Dates From Colorado W Durango Area. Tucson: University of Arizona.

Robinson, William J, and Bruce G Harrill. 1974. Tree-Ring Dates From Colorado V Mesa Verde Area. Tucson: University of Arizona.

Douglass, AE. 1907. ?Boating Down The Colorado?. University Of Arizona Monthly 8 (No. 1). University Of Arizona Monthly.