plow more than 12 acres (4.9 hectares) in a normal day pulling two 14-inch (360 mm) plows, outperforming the tractive performance of the heavier and more
recreation management". Ursus. 13: 357–360. JSTOR 3873216. Austin, M. A., Wrenshall, C. (2004). An Analysis of Reported Grizzly Bear (Ursus arctos): Mortality
Bear (Ursus arctos)". Mammals of Texas- Online Edition. Kaczensky, P.; Blazic, M.; Gossow, H. (2004). "Public attitudes towards brown bears (Ursus arctos)