It also depends on the era and contracts you are interested in.
There are good specialized books that get into more detail when it comes to (for example) police, navy, Simson, Swiss, Mauser, Post war, etc...
John Walter recently published an updated version of his Luger book. Lots of text, but it will teach the basics quickly.
Görtz/Sturgess stops in 1945.
The Mauser Parabellum book discusses the 1930-48 era,
Etc...
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