Peterson 1935 About 40 traps set along Goose Creek to E of ranch house. Evidence of presence of beaver noted in form of a dam, many tracks, and slides with trampled glass. Deer tracks + feces noticed along river banks. Three rat traps set about buildings. July 12 Catch consisted of one Microtus montanus and 5 Peromyscus m. sonoriensis. No rats. Two blackhids shot in willows on river bank. Skins prepared of the Microtus montanus, 2 Peromyscus m. sonoriensis and one Euphegus cygnophilus. Rest of 2 adult Peromyscus m. sonoriensis with 5 young, able to run about but with eyes still closed, found between outer wall boards + tar paper interior nailed on 2 x 4 studdings of small frame ranch building. 65 mouse traps set along river + base of slope, grevelly, sandy + rather grown over with sage brush with occasional juniper. 3 no.3 Victor traps set in river for beaver. Conventional type of set used with beaver castor for scent. Conventional method consists of setting trap in about 4 inches of water a foot or so from water line (in slides, trails, etc often or recently frequented by beaver as evidenced