Map of the territory of the United States, west of the Mississippi River / prepared by authority of the Hon. the Secretary of War, in the office of the Chief of Engineers under the direction of Brig. Gen. A.A. Humphreys, Chief of Engrs. Bvt. Major General
MLA
Freyhold, Edward. Map of the Territory of the United States, West of the Mississippi River / Prepared by Authority of the Hon. the Secretary of War, in the Office of the Chief of Engineers under the Direction of Brig. Gen. A.A. Humphreys, Chief of Engrs. Bvt. Major General. War Dept., 1879. https://collections.library.yale.edu/catalog/15812964.
APA, 6th edition
Freyhold, E. (1879). Map of the territory of the United States, west of the Mississippi River / prepared by authority of the Hon. the Secretary of War, in the office of the Chief of Engineers under the direction of Brig. Gen. A.A. Humphreys, Chief of Engrs. Bvt. Major General [Maps]. War Dept., https://collections.library.yale.edu/catalog/15812964.
