SF-51. Trail. Bear Grass.
MLA
McClintock, Walter, 1870-1949. SF-51. Trail. Bear Grass.. Box 145, folder 7493. undated. https://collections.library.yale.edu/catalog/10453636.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 145, folder 7493"])(undated)[SF-51. Trail. Bear Grass.]. https://collections.library.yale.edu/catalog/10453636.