[Ron Wood]

I am biting my toungue as I write this, but Aarron Davis published a small format book "The Luger Handbook" that has an excellent "flow chart" in the front for Luger identification. I am reluctant to recommend this book for other than the flow chart as it has several errors in the narritive descriptions, so you can't rely on it 100% for positive identification. It is too bad, since otherwise Aarron did a pretty clever job. It is inexpensive and handy to carry around as it is pocket size. It is a place to start, but look to other references for detailed information on specific variation once you have identified it.