Cite

Chapman's sectional map of Wisconsin [cartographic material] : with the most recent surveys.

MLA

Chapman, Silas. Chapman's Sectional Map of Wisconsin [Cartographic Material] : with the Most Recent Surveys. Dyer & Pasmore ;, Raymond & Selleck, 1857. https://collections.library.yale.edu/catalog/15814529.

APA, 6th edition

Chapman, S. (1857). Chapman's sectional map of Wisconsin [cartographic material] : with the most recent surveys. [Maps]. Dyer & Pasmore ;, Raymond & Selleck, https://collections.library.yale.edu/catalog/15814529.