MapSketch given by George Drewyer, 5th August 1808 : [Bighorn River, Wyoming and Montana].
Sketch given by George Drewyer of the Bighorn River, 5th August 1808 In pencil on verso: Transferred from Department of Interior, Office of Indian Affairs, Jan. 7, 1925, St. no. 5812-2. Pen-and-ink and pencil. Notes and calculations in ink on verso. Available also through the Library of Congress Web site as a raster image.
- Contributor: Drewyer, George
- Date: 1808