MLA

Map of a Portion of Point Keweenaw, L.S. : Showing the Lands &c. of the Pennsylvania & Delaware Mining Co's. [publisher not identified], , 0AD. https://collections.library.yale.edu/catalog/16680805.

APA, 6th edition

Map of a portion of Point Keweenaw, L.S. : showing the lands &c. of the Pennsylvania & Delaware Mining Co's. (0 C.E.). [Annotations (Provenance)--20th century, Cadastral maps, Maps]. [publisher not identified], . https://collections.library.yale.edu/catalog/16680805.