 On the evening of October 11, 1869, Cook, Folsom and Peterson, after 36 days of travel returned to Diamond City, Montana.Shortly after his return from Yellowstone, Folsom was employed as field surveyor by Henry Washburn, the Surveyor General of the Montana Territory.While in that office, Cook and Folsom shared their experiences and diaries with Washburn and W. W. deLacy, the territorial map maker.