Approximately 41 books covering an array of topics including firearms, bayonets, swords, and helmets. Some titles include but are not limited to: "The U.S. Krag Bayonets" by Donald J. Hartman, "American Military Shoulder Arms" volumes 1-3 by George D. Moller, "Bayonets of the World" volumes 1-4 by Paul Kiesling, "Hall's Military Breechloaders" by Peter A. Schmidt, "Steel Pots: The History of America's Steel Combat Helmets" by Chris Armold, "Helmets of the Eto" by Regis Giard and Frederic Blais, "Spencer Repeating Firearms" by Roy. M Marcot, "Civil War Cavalry & Artillery Sabers" by John H. Thillmann, and "The Krag Rifle Story" by Franklin B. Mallory and Ludwig Olson.