Cite

[Monument to Major John Wesley Powell]

MLA

Powell, John Wesley, 1834-1902. [Monument to Major John Wesley Powell]. Box 4 | Folder 137. undated. https://collections.library.yale.edu/catalog/2025227.

APA, 6th edition

Powell, John Wesley, 1834-1902. (["Box 4 | Folder 137"])(undated)[[Monument to Major John Wesley Powell]]. https://collections.library.yale.edu/catalog/2025227.