This primary source comes from the General Records of the Department of the Navy.
National Archives Identifier:
520713Full Citation: Atomic cloud during 'Able Day' blast at Bikini. First picture of atomic shock wave; 7/1/1946; General Records of the Department of the Navy, Record Group 80. [Online Version, https://www.docsteach.org/documents/document/atomic-cloud-during-able-day-blast-at-bikini-first-picture-of-atomic-shock-wave, October 5, 2024]