509th Composite Group

The 509th Composite Group (509 CG) was a unit of the United States Army Air Forces created during World War II. They tasked with the operational deployment of nuclear weapons. It conducted the atomic bombings of Hiroshima and Nagasaki, Japan, in August 1945.

• Bowers, Peter M. (1999). Boeing B-29 Superfortress. Stillwater, Minnesota: Voyageur Press. ISBN 0-933424-79-5.
• Dvorak, Darrell F. (2012). "The Other Atomic Bomb Commander: Colonel Cliff Heflin and his "Special" 216th AAF Base Unit" (PDF). Airpower Historian. Archived from the original (PDF) on 27 March 2016. Retrieved 5 September 2015.
• Mann, Robert A. (2004). The B-29 Superfortress: A Comprehensive Registry of the Planes and Their Missions. Jefferson, North Carolina: McFarland & Company. ISBN 0-7864-1787-0. OCLC 55962447.
• Marx, Joseph L. (1967). Seven Hours to Zero. New York: G.P. Putnam Sons. OCLC 913500.
• Ossip, Jerome J., ed. (1946). 509th Composite Group History – 509th Pictorial Album. Chicago, Illinois: Rogers Printing Company. OCLC 10065336.
• Rowe, James L. (1978). Project W-47. Livermore, California: JA A RO Publishing. ISBN 0-9605562-0-6.
• Thomas, Gordon; Morgan-Witts, Max (1977). Enola Gay. New York: Stein & Day Publishing. ISBN 0-8128-2150-5.
• Wheeler, Keith (1982). Bombers over Japan. Virginia Beach, Virginia: Time-Life Books. ISBN 0-8094-3429-6.

• Atomic Heritage Foundation
• 509th Composite Group Page, Atomic Heritage Foundation
• National Museum of the USAF B-29 Superfortress fact sheet