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Proctor, M. et al. 2004. A comparative analysis of management options for grizzly bear conservation in the U.S.-Canada trans-border area. Ursus 15(2): 145-160
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Kasworm. W. and T. Manley. 1990. Road and trail influences on grizzly bears and black bears in Northwest Montana Ursus, Vol. 8, pp. 79-84