MLA

Corps, United States. Army. Signal. War Department Weather Map / Published by Authority of the Secretary of War. Signal Service, U.S. Army, 1872. https://collections.library.yale.edu/catalog/15603703.

APA, 6th edition

Corps, U. S. A. S. (1872). War Department weather map / published by authority of the Secretary of War. [Maps]. Signal Service, U.S. Army, https://collections.library.yale.edu/catalog/15603703.