@mastersthesis {489, title = {The Stability of the Northern Canadian Tree Limit: Current Regenerative Capacity}, volume = {PhD}, year = {1979}, school = {University of Colorado}, url = {http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=751614031\&sid=5\&Fmt=1\&clientId=43922\&RQT=309\&VName=PQD}, author = {Elliott, Deborah} }