This primary source comes from the Records of the U.S. Food Administration.
National Archives Identifier:
512434Full Citation: Photograph 4-G-36(1); Attaching a Message to a Signal Corps Carrier Pigeon; ca 1917-1918; Photographs of Food Conservation Activities, 1917 - 1919; Records of the U.S. Food Administration, Record Group 4; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/carrier-pigeon, March 29, 2024]