SF-277. Frozen Brook and Hemlocks.
MLA
McClintock, Walter, 1870-1949. SF-277. Frozen Brook and Hemlocks.. Box 146, folder 7717. undated. https://collections.library.yale.edu/catalog/10453862.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 146, folder 7717"])(undated)[SF-277. Frozen Brook and Hemlocks.]. https://collections.library.yale.edu/catalog/10453862.