Blanchard's map of Chicago and environs.
MLA
Blanchard's Map of Chicago and Environs. Rufus Blanchard, 1887. https://collections.library.yale.edu/catalog/15814419.
APA, 6th edition
Blanchard's map of Chicago and environs. (1887). [Maps]. Rufus Blanchard, https://collections.library.yale.edu/catalog/15814419.