I'm looking for information about the Colt black powder revolvers that were re issued in (I think) the early 1970s, specifically the 2nd generation ones. Is there a book about just these Colts? I'd like to know how many were made and how many different varieties there were and serial number ranges. There were Dragoons, 1851 Navies, and 1860 Armies. I'm interested in the 1851 Navy and 1860 Army models. There is also a 3rd generation but I'm not to concerned about those.