My husband is a direct Humbarger/Humberger descendant. There is a very interesting article concerning the gunsmiths in The Association of Ohio Longrifle Collectors publication Vol. XV Number II August, 1993. I have a copy of this that was given to my by my father-in-law. I would be happy to mail you a copy if you are interested. The article is mostly regarding Henry Humbarger, but many others are mentioned, as are listings regarding estate holdings.