Military map of Nebraska and Dakota / by Lieut. G.K. Warren, Topl. Engrs., from the explorations made by him in 1855.6 while attached to the staff of Brev. Brig. Gen. W.S. Harney, commg. Sioux Expedn., and in 1857 under the direction of the Office Explns.Warren, Gouverneur Kemble, 1830-18821858]"35th Congress, 1st Session. Printed by order of the U.S. Senate."Preliminary report of explorations in Nebraska and Dakota in the years 1855-'56-'57," originally printed in the appendixes to the Report of the Secretary of War, in the President's messagecartographic