So to sum up:
The Luger Book: The Encyclopedia of the Borchardt and Borchardt-Luger Handguns (John Walter) - BOUGHT for $23.95
Imperial Lugers (Jan Still, First Edition) - BOUGHT for $215 with shipping!
So next should be "The Luger Story" and "The Borchardt & Luger Automatic Pistols" ? (Put on wishlist for my birthday).
Anything else you could advise?
Thank you for all your replies!
This is the best place for those who interested in Lugers and also I've never met better community than you all guys!