There is one that will pop up... The SKS Carbine by Joe Poyer and Steve Kehaya...I have a copy...somewhere... it contains pretty good basic information on individual parts and pieces.. some of the historical information is questionable and speculative in my opinion, some information has been found to be out of date.
Some books are hard to do, ones like Lugers, Mausers and Finnish Mosins not much changes over time, when your dealing with China who wont release information, one piece of new information can render a book inaccurate.
The White Death.. thats always one I wanted to check out.. The Finn's...they were some ballsy people and make great arms.