Cite

"Fort Vancouver claim formerly James Douglas." Manuscript map

MLA

"Fort Vancouver Claim Formerly James Douglas." Manuscript Map. 0AD. https://collections.library.yale.edu/catalog/17232938.

APA, 6th edition

"Fort Vancouver claim formerly James Douglas." Manuscript map. (0 C.E.). [Manuscript maps]. https://collections.library.yale.edu/catalog/17232938.