Larocque's Yellowstone Journal provides a picture of the early fur trade with the Mandan and Hidatsa Indians in North Dakota. As he traveled with a Crow Indian camp on its way back home to the Yellowstone, Larocque described the various countrysides from the Hidatsa village Big Hidatsa at Knife River, upstream Powder River and along the Bighorn Mountains. During the 2½ months long journey, he and the Crows made camps in the modern states of North Dakota, Wyoming and Montana. Probably, Larocque's detailed record gives a better understanding of the day-to-day rhythm of camp movement and the factors conditioning this movement than any other known document … on a typical plains people.: It also adds to the history and ethnography of the Crows.: