Cite

Evans's Map 1 (the Expedition's route about August 13-September 10, 1804)

MLA

Clark, William, 1770-1838. Evans's Map 1 (the Expedition's route about August 13-September 10, 1804). Box 1, folder 4. circa 1803-1810. https://collections.library.yale.edu/catalog/2002445.

APA, 6th edition

Clark, William, 1770-1838. (["Box 1, folder 4"])(circa 1803-1810)[Evans's Map 1 (the Expedition's route about August 13-September 10, 1804)]. https://collections.library.yale.edu/catalog/2002445.