SF-48. Trail. Bear Grass.
MLA
McClintock, Walter, 1870-1949. SF-48. Trail. Bear Grass.. Box 145, folder 7490. undated. https://collections.library.yale.edu/catalog/10453633.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 145, folder 7490"])(undated)[SF-48. Trail. Bear Grass.]. https://collections.library.yale.edu/catalog/10453633.