Hello Robert,
I woud sugggest three books to start with :
Fred A. Datig's "The Luger Pistol"
Harry Jones' "The Luger Variations"
Charles Kenyon's "Lugers At Random"
These are older books, out-of-date, and somewhat "dated"; but they give a real history to what was written about lugers 30-40 years ago and are filled with interesting "history" info. (especially the Datig book...).
These are offered on e-Bay as well as on Amazon.com from time to time. You might also try this book seller :
http://www.rayrilingarmsbooks.com/cgi-bin/rrb455.cgi
After these, the excellent 4-5 books by Jan Still, and other books such as "The Dutch Luger", "Krieghoff Parabellum", "History of the Swiss Parabellum" etc. are good ones with very model-specific and pistol-specific info. that is much more up-to-date...
And there are many. many other books...
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />