Sketch of the public surveys in Wisconsin and territory of Minnesota.
MLA
Surveyor General of Iowa, Wisconsin, and Minnesota. Sketch of the Public Surveys in Wisconsin and Territory of Minnesota. Surveyor General's Office, 1855. https://collections.library.yale.edu/catalog/15814528.
APA, 6th edition
Surveyor General of Iowa, W., & M. (1855). Sketch of the public surveys in Wisconsin and territory of Minnesota. [Maps]. Surveyor General's Office, https://collections.library.yale.edu/catalog/15814528.