Unidentified
MLA
Koch, Frederick R. (Frederick Robinson). Unidentified. Box 59, folder 1340. 1863 Dec 21. https://collections.library.yale.edu/catalog/16601872.
APA, 6th edition
Koch, Frederick R. (Frederick Robinson). (["Box 59, folder 1340"])(1863 Dec 21)[Unidentified]. https://collections.library.yale.edu/catalog/16601872.