Steve,
Found this posting with a Google search.
http://forums.1911forum.com/showthread.php?t=68064
I've owned 3 or 4 of the Argentine 1911s. I haven't found a comprehensive book, but managed to piece together information from old articles, such as Guns&Ammo "Surplus Firearms" periodicals, "Hand Guns of the World", "Know Your 1911" by E.J. Hoffschmidt published by Blacksmith Press, etc.
Ron