If you go to
http://chevy.tocmp.com/ you will find Keith Hardy's collection of over 200 Chevrolet manuals free on line.
He only has a few wartime manuals and no specific CMP ones but many of the 1939-46 period truck manuals will have much information directly relevent to CMP's and of course those with 4X2 Chevrolets of this period will find their manual.
Lang