Hi Igor,
Imperial Lugers is my favorite Luger reference of all time and it's well worth reaching for. It's a little dated now but it's the most readable of all. For the same money You can buy the Borchardt 3 volume work by Görtz/Sturgess from Simsons for $300.00, it contains everything you need to know, and a lot you don't need. It's a bit of a slog but it's very up to date.
Norm
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