Cite

Map of the state of Oregon and Washington Territory / compiled in the Bureau of Topogrl. Engrs. chiefly for military purposes, by order of John B. Floyd ; engraved by W.H. Dougal.

MLA

of Topographical Engineers, United States. Army. Corps. Map of the State of Oregon and Washington Territory / Compiled in the Bureau of Topogrl. Engrs. Chiefly for Military Purposes, by Order of John B. Floyd ; Engraved by W.H. Dougal. The Bureau], 1859. https://collections.library.yale.edu/catalog/15821570.

APA, 6th edition

of Topographical Engineers, U. S. A. C. (1859). Map of the state of Oregon and Washington Territory / compiled in the Bureau of Topogrl. Engrs. chiefly for military purposes, by order of John B. Floyd ; engraved by W.H. Dougal. [Maps]. The Bureau], https://collections.library.yale.edu/catalog/15821570.