SF-265. First Spring Flowers and Plants. Marshy Places. Trail to Piegan Pass.
MLA
McClintock, Walter, 1870-1949. SF-265. First Spring Flowers and Plants. Marshy Places. Trail to Piegan Pass.. Box 146, folder 7705. undated. https://collections.library.yale.edu/catalog/10453850.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 146, folder 7705"])(undated)[SF-265. First Spring Flowers and Plants. Marshy Places. Trail to Piegan Pass.]. https://collections.library.yale.edu/catalog/10453850.