726. [Mountains and River valley.]
MLA
McClintock, Walter, 1870-1949. 726. [Mountains and River valley.]. Box 74, folder 4260. 1905 1941. https://collections.library.yale.edu/catalog/2010701.
APA, 6th edition
McClintock, Walter, 1870-1949. (["Box 74, folder 4260"])(1905 1941)[726. [Mountains and River valley.]]. https://collections.library.yale.edu/catalog/2010701.