Map of the Yellowstone and Missouri Rivers and their tributaries / explored by W.F. Raynolds and H.E. Maynadier, 1859-60 ; revised and enlarged by G.L. Gillespie ; engraved in the Office of the Chief of Engineers.
MLA
Gillespie, G. L. Map of the Yellowstone and Missouri Rivers and Their Tributaries / Explored by W.F. Raynolds and H.E. Maynadier, 1859-60 ; Revised and Enlarged by G.L. Gillespie ; Engraved in the Office of the Chief of Engineers. Office of the Chief of Engineers, U.S. Army, 1876. https://collections.library.yale.edu/catalog/15812963.
APA, 6th edition
Gillespie, G. L. (1876). Map of the Yellowstone and Missouri Rivers and their tributaries / explored by W.F. Raynolds and H.E. Maynadier, 1859-60 ; revised and enlarged by G.L. Gillespie ; engraved in the Office of the Chief of Engineers. [Maps]. Office of the Chief of Engineers, U.S. Army, https://collections.library.yale.edu/catalog/15812963.