The A-20D was a proposed lightweight version of the A-20B with more
powerful turbosupercharged R-2600-7 engines. In addition, larger fuel
tanks were added. However, these tanks were not self-sealing and
would have been a definite hazard in combat. Since the turbosupercharged
A-20 had not been a success, this project never got past the initial
American Combat Planes, Third Enlarged Edition, Ray Wagner, Doubleday,
McDonnell Douglas Aircraft Since 1920, Vol 1, Rene J. Francillon,
Naval Institute Press, 1988
United States Military Aircraft Since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
A-20 Havoc in Action, Aircraft Number 144, Squadron/Signal Publications,
Jim Mesko, 1994.
Famous Bombers of the Second World War, William Green, Doubleday, 1960
Boston, Mitchell and Liberator In Australian Service, Stewart Wilson,
Aerospace Publications, 1992.
Jane's Fighting Aircraft of World War II, Military Press, 1989.