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M. Vavra, Walburger, K. J., Delcurto, T., Ritchie, M. W., Maguire, D. A., and Youngblood, A., Ungulate ecology of ponderosa pine ecosystems in the northwest , Proceedings of the Symposium on Ponderosa Pine: Issues, Trends, and Management, vol. Gen. Tech. Rep PSW-GTR-198. Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture, Klamath Falls , OR & Albany , CA , pp. 145-158, 2005.