MLA

Palmquist, Peter E. (1936-2003). Redwood Empire Association. Box 87. circa 1850-2003. https://collections.library.yale.edu/catalog/12246629.

APA, 6th edition

Palmquist, Peter E. (1936-2003). (["Box 87"])(circa 1850-2003)[Redwood Empire Association]. https://collections.library.yale.edu/catalog/12246629.