Military map of the United States & territories showing the location of the military posts, arsenals, Navy Yards, & ports of entry. Compiled from pub-doc--1861.
MLA
Duval, P. S., and Son. Military Map of the United States & Territories Showing the Location of the Military Posts, Arsenals, Navy Yards, & Ports of Entry. Compiled from Pub-Doc--1861. Published by P.S. Duval & Son, 1861. https://collections.library.yale.edu/catalog/15603783.
APA, 6th edition
Duval, P. S., & S. (1861). Military map of the United States & territories showing the location of the military posts, arsenals, Navy Yards, & ports of entry. Compiled from pub-doc--1861. [Maps]. Published by P.S. Duval & Son. https://collections.library.yale.edu/catalog/15603783.
