"An Incident of the Great Snow Storm."
MLA
Hansen, Bert, 1944-. "An Incident of the Great Snow Storm.". Box 6, folder 1. 1882 January 21. https://collections.library.yale.edu/catalog/32326626.
APA, 6th edition
Hansen, Bert, 1944-. (["Box 6, folder 1"])(1882 January 21)["An Incident of the Great Snow Storm."]. https://collections.library.yale.edu/catalog/32326626.