This is what I have observed having read through both and being a carbine collector:

Ruth's good, lots of good information that is correct and broken down by maker.

Ruth's not so good, difficult to follow and find good usable information without doing some digging.

Riesch's good, very user friendly, easy to follow and a great quick reference guide.

Riesch's not so good, a lot of wrong and or incomplete information that may lead a first time collector down the wrong path.

Anyone have any other thoughts?
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