SF-42. Trail. Bear Grass.
MLA
McClintock, Walter, 1870-1949. SF-42. Trail. Bear Grass.. Box 145, folder 7484. undated. https://collections.library.yale.edu/catalog/10453627.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 145, folder 7484"])(undated)[SF-42. Trail. Bear Grass.]. https://collections.library.yale.edu/catalog/10453627.