After nine weeks' research at the National Archives we found many revisions to this aircraft's history, including:- Development- Engine installation- Fixed armament- That "kidney-shaped" lump on the right side of the forward fuselage- Canopy design- Hydraulics - Armor- Formation lights- Assistant pilot's flexible machine gun- Norden bomb sight installation- Gunner's installation- Radio revisions- Both approach light configurations- Mark XLII bomb racks- Wing folds- Floatation gear- Main gear strut revisions- Production deliveries- Paint schemes- Squadron histories- Wartime record Additionally, the photos have been copied at very high resolution, and they're printed large, generally one to a page - you can see all the details.