Cite

Evans's Map 3 (the Expedition's route about September 23-October 3, 1804)

MLA

Clark, William, 1770-1838. Evans's Map 3 (the Expedition's route about September 23-October 3, 1804). Box 1, folder 6. circa 1803-1810. https://collections.library.yale.edu/catalog/2002447.

APA, 6th edition

Clark, William, 1770-1838. (["Box 1, folder 6"])(circa 1803-1810)[Evans's Map 3 (the Expedition's route about September 23-October 3, 1804)]. https://collections.library.yale.edu/catalog/2002447.