I gave that link to my wife Santa and she he came through with flying colors. I received copies of:
Uniforms, Arms, and Equipment: The U.S. Army on the Western Frontier 1880-1892 (2-Volume Set) - Douglas C. McChristian;
The U.S. Army in the West, 1870-1880: Uniforms, Weapons, and Equipment - Douglas C. McChristian
Horse Soldier, Volumes. I through III - Randy Steffen