1891 Map of the Department of Dakota including Minnesota, North Dakota, Montana, Yellowstone National Park, and that portion of South Dakota lying north of the forty-fourth parallel of north latitude - commonwealth cj82kq06h. From the Digital Commonwealth (<a rel="nofollow" class="external free" href="https://www.digitalcommonwealth.org/search/commonwealth:cj82kq06h">https://www.digitalcommonwealth.org/search/commonwealth:cj82kq06h</a>).
United States Army, Dept. of Dakota, Engineer Office
Digital Commonwealth