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.
MLA
Warren, Gouverneur Kemble, 1830-1882. 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.. BRBL_00534. 1858?]. https://collections.library.yale.edu/catalog/15812943.
APA, 6th edition
Warren, Gouverneur Kemble, 1830-1882. (["BRBL_00534"])(1858?])[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.]. https://collections.library.yale.edu/catalog/15812943.