This primary source comes from the Records of the Office of the Chief of Naval Operations.
Full Citation: Special Air and Gunnery Target Map of Iwo Jima; 11/12/1944; Iwo Jima; Records Relating to Naval Strategy, 1915 - 1985; Records of the Office of the Chief of Naval Operations, Record Group 38; National Archives at College Park, College Park, MD. [Online Version, https://www.docsteach.org/documents/document/special-air-and-gunnery-target-map-of-iwo-jima, May 12, 2024]