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I don't recall the name of the publishing companies and book sellers but there were a number that were associated with the Soldier of Fortune magazine as advertisers. They were also part of the various gun show circuits. They would be more likely to have a book or two on the subject.
Cold Steel used to make some you might contact them too.
A very good book on the subject is Antique American Switchblades: Identification & Value Guide by Mark Erickson and published in 2004 by Krause Publications. I highly recommend it.