Clason's double indexed map, Chicago.
MLA
Company, Clason Map. Clason's Double Indexed Map, Chicago. Clason Map Co., 0AD. https://collections.library.yale.edu/catalog/15952230.
APA, 6th edition
Company, C. M. (0 C.E.). Clason's double indexed map, Chicago. [Maps]. Clason Map Co., https://collections.library.yale.edu/catalog/15952230.