Cite

SF-50. Trail. Bear Grass.

MLA

McClintock, Walter, 1870-1949. SF-50. Trail. Bear Grass.. Box 145, folder 7492. undated. https://collections.library.yale.edu/catalog/10453635.

APA, 6th edition

McClintock, Walter, 1870-1949. (["Box 145, folder 7492"])(undated)[SF-50. Trail. Bear Grass.]. https://collections.library.yale.edu/catalog/10453635.