Most of the books are out of print, but can be found on Amazon. But get ready for some sticker shock. Here are most of my research library: Civil War Projectiles by McKee and Mason, Round Ball to Rimfire by Thomas, Military Fuses of the Civil War by Jones, Excavated Artifacts from Battlegrounds and Campsites by Phillips, Plates and Buckles of American Military by Kerksis, Civil War Artifacts of the Western Campaign by Harris, Civil War Artifacts by Crouch, Confederate Belt Buckles and Plates by Mullinax, Illustrated History Of Civil War Relics by Silva and O'Donald, Civil War Relics from South Carolina by Topper, American Military Belt Plates by O'Donnel and Campbell, Relic Hunter by Crouch, Uniform Buttons of the United States, by Tice, Record of American Uniform and Historic Buttons by Albert, and American Military Buttons, Makers and Dealers by McGuinn and Bazelon.