MLA

Seymour, J. O., and Co. Map of Property of the Globe Copper Company and Mines in the Portage Lake District. J.O. Seymour & Co., 0AD. https://collections.library.yale.edu/catalog/16680799.

APA, 6th edition

Seymour, J. O., & C. (0 C.E.). Map of property of the Globe Copper Company and mines in the Portage Lake District. [Cadastral maps., Mine maps.]. J.O. Seymour & Co., https://collections.library.yale.edu/catalog/16680799.