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There isn't really a good book on the M9. The latest entry, American Gladius, is in my opinion lacking complete information and decent photographs. There are also some definite errors in the information provided. Gary Cunningham's book provides decent but limited information. Homer Brett's book shows many of the scarcer variations but has very little information on the common variations.
Your best bet as a beginning collector is to read all of the threads on this site. The combined information found here far surpasses any available book on the subject.
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