G570. Picketing Horses, Prairie, Good Clouds, Silver Lining.
MLA
McClintock, Walter, 1870-1949. G570. Picketing Horses, Prairie, Good Clouds, Silver Lining.. Box 105, folder 4890. 1905 Summer. https://collections.library.yale.edu/catalog/10450635.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 105, folder 4890"])(1905 Summer)[G570. Picketing Horses, Prairie, Good Clouds, Silver Lining.]. https://collections.library.yale.edu/catalog/10450635.