Letter from George Mercer Dawson to John William Dawson, written from Reuter Montana.

Map of Montana and Wyoming Territories. Includes the text: Embracing most of the country drained by the Madison, Gallatin and Upper Yellowstone Rivers. Geology by F.V. Hayden, assisted by A.C. Reale. Drawn by Henry Gannett, from notes and sketches by Adolf Burck, chief topographer of the Yellowstone division.