MLA

Co, Rand Avery Supply. Map of Mount Desert Island and the Coast of Maine Issued by Passenger Department of Boston & Maine Railroad. Boston & Maine Railroad, 1892. https://collections.library.yale.edu/catalog/15607004.

APA, 6th edition

Co, R. A. S. (1892). Map of Mount Desert Island and the coast of Maine issued by passenger department of Boston & Maine Railroad. [Maps]. Boston & Maine Railroad, https://collections.library.yale.edu/catalog/15607004.