Luger books and references recommendations?

[VN Vet]

I recently purchase the STANDARD CATALOG OF LUGER by Aarron Davis Pub. 2006. It gives identification and pricing (2006) for various models. I like it. Anyway it is not an expensive book.

I also have THE LUGER BOOK by John Walter Puib. 1991. It has lots or good reading information too on Borchard Lugers; 1885 to 1985.