I never been to it , but seems there is a museum in Odgen Utah, that has guns by the father..Not sure if Cody Museum In Wyoming has any by Jonathan, but they may since the son John designed a bunch of guns for Winchester..There was a gun , plain looking muzzler loader awhile back on one of the online sites that was suppose to be a Jonathan gun, can't remeber where..I think a recent Rock Island auction had one of Jonathan's Harmonica guns at auction ,you may be able to find it in their past auctions...In the book, " John M. browning American Gunmaker, there is some stuff on the father, not a lot of pics, though..One of the amazing things about John, was most of the first guns he made worked flawlessly. What I mean is his prototypes was final design, unlike most big companies that had a lot of trial & error..