The Story of The 1855 Root Model Revolvers by S.Gerald Keogh,Copyright 1964.It measures 8-1/2" x 10-7/8" with 31 pages.The first 10 pages are a history of the Colt Solid Frame Side-Hammer revolver followed by 18 pages of the New Model Pocket Pistols featuring 12 models pictured with specs,markings and serial number ranges listed. Very Good+ condition with light soiling on the covers