SF-152. Trail.
MLA
McClintock, Walter, 1870-1949. SF-152. Trail.. Box 145, folder 7592. undated. https://collections.library.yale.edu/catalog/10453737.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 145, folder 7592"])(undated)[SF-152. Trail.]. https://collections.library.yale.edu/catalog/10453737.