Relief shown by hachures. Shows towns, counties, location of Indian tribes in Colorado, Nebraska and Kansas. Shows parts of the Nebraska and Dakota Territories later to become part of Wyoming. "Entered 1860 in the Clerks Office of the District Court for the Eastern District of Pennsylvania by S. Augustus Mitchell Jr." In lower right corner: "48". Appears to be from an atlas published by S. Augustus Mitchell, Jr., ca. 1867, p. 48. Prime meridians: and Washington, D.C. and Greenwich.