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.