Here is what the U. S. Army Military History Institute, Carlisle Barracks, Pa hold in their unit bibliography:

U.S. Army Heritage & Education Center Civil War Unit: 2nd Missouri Cavalry Regiment 950 Soldiers Drive
Carlisle Barracks, PA 17013-5021

18 Oct 2012

2nd Missouri Cavalry Regiment

Baird, Samuel. With Merrill's Cavalry: The Civil War Experiences of...2nd Missouri Cavalry, U.S.A. San Marcos, CA: Book Habit, 1981. 51 p.

Dyer, Frederick H. A Compendium of the War of the Rebellion. Vol. 2. Dayton, OH: Morningside, 1979. p. 1303. (Concise summary of the regiment's service).

Missouri. AGO. Annual Report...for 1864 & 1865. Jefferson City, MO: W.A. Curry, 1865. pp. 161- 65 & 314-20.
Roster of officers and regimental history.

Our Photo Archive includes images of individuals of this unit.

The following personal papers are in the Institute's Manuscript Archive:

Gordon, George W. - GordonColl (Major's typescript diary, 1861-64)

Hubbard, Elijah - LeighColl Book 8: 47 (Letter to Lt, Sep 22, 1861)

Johnston, William A. - CWTIColl (Enlisted man's memoirs, Jul-Aug 1862)