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and Attack Aircraft, 1937–1945. Manchester: Crecy Publishing. ISBN 978-1906537487. Francillon, René J. (1988). McDonnell Douglas aircraft since 1920 :...

and Attack Aircraft, 1937-1945. Manchester: Crecy Publishing. ISBN 978-1906537487. "Douglas XB-31". Francillon, René J. McDonnell Douglas Aircraft since...

Alan, 2015. American Secret Projects: Fighters, Bombers, and Attack Aircraft, 1937–1945. Manchester: Crecy Publishing. ISBN 978-1906537487. Bell XP-52...

Griffith, Alan, 2015. American Secret Projects: Fighters, Bombers, and Attack Aircraft, 1937–1945. Manchester: Crecy Publishing. ISBN 978-1906537487....