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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.\par \par 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.\par \par Tree-Ring Dates From New Mexico C-D Northern Rio Grande Area. 1971. Tucson: University of Arizona.\par \par }