These are WWII War Department copies of TM 9-305 75mm M1897 and TM 9-306 75mm Gun in Vehicles, an Easy 1 Productions manual on compact disc.    This not one of the poor reproductions that are easily found on the Internet; all scans are in jpeg. form and at 400 dpi.  The CD contains the two manuals.  Also included are 33 photos of the 75mm and 135 photos of the Gun Motor Carriage.  As always, if this CD is ever updated with new material, you are entitled to the upgrade.  Follow Easy 1 Productions on Facebook.