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.

Hessl, Amy. 2000. ?Aspen: Ecological Processes And Management Eras In Northwestern Wyoming, 1807--1998?. Geology And Geography. Geology And Geography. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=731957311&sid=11&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Tausch, Robin. 1980. ?Allometric Analysis Of Plant Growth In Woodland Communities?. Range Science. Range Science. Utah State University. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=749271331&sid=1&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Douglass, AE. 1920. ?Evidence Of Climatic Effects In The Annual Rings?. Ecology 1 (No. 1). Ecology.