Cite

U.S. Cavalry drilling

MLA

Horne, Walter H., 1883-1921. U.S. Cavalry drilling. Folder 5. https://collections.library.yale.edu/catalog/2015375.

APA, 6th edition

Horne, Walter H., 1883-1921. (["Folder 5"])[U.S. Cavalry drilling]. https://collections.library.yale.edu/catalog/2015375.