A-20E was the designation assigned to 17 A-20As lightened and used for
training and various experimental projects. It is believed that many
of these were late production A-20As fitted with 1690 hp R-2600-11
engines. The serial numbers of the A-20Es are unknown.
Sources:
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American Combat Planes, Third Enlarged Edition, Ray Wagner, Doubleday,
1982.
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McDonnell Douglas Aircraft Since 1920, Vol 1, Rene J. Francillon,
Naval Institute Press, 1988
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United States Military Aircraft Since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
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A-20 Havoc in Action, Aircraft Number 144, Squadron/Signal Publications,
Jim Mesko, 1994.
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Famous Bombers of the Second World War, William Green, Doubleday, 1960
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Boston, Mitchell and Liberator In Australian Service, Stewart Wilson,
Aerospace Publications, 1992.
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Jane's Fighting Aircraft of World War II, Military Press, 1989.