SPECIFICATIONS FOR CLOTHING AND EQUIPAGE 1897 by the quartermaster Generals Office, War Department (Reprinted by Prostak Publishing)
U. S. Army Uniforms and Equipment, 1889 By the Quartermaster General of the Army (reprinted by Bison Books with Foreword by Jerome Greene)
American Military Belts and Related Equipments By R. Stephen Dorsey
For Collectors Only The American Krag Rifle and Carbine by Joe Poyer Edited by Craig Riesch (I'm including this because it covers belts and such too)
This brings to mind what could become a new stickied thread. If the someone would post a books reference page beginning with what we have posted here. Then invite everyone to reply with other good reference books.
And so it shall be!