It's too bad the book "The Johnson Record" by Susanne Warren-Bicio is no longer available. I believe it was also referred to as " The Book of Lancaster, Carving Details for the Gunmaker"- Full Size, Presision Carving Study of Original Longrifles by Susanne Warren-Bicio.
As stated, it's a book of full-sized carvings, but pencil drawn and shaded to they can be copied onto new work more easily than from pictures. Susanne's website is no longer up. I don't know if Ryan at Muzzleloader Builder Supply would know if any are still available anywhere. Her books are no longer on the MBS website. (Susanne used to own MBS).