It might be the document held by the U. S. Army Military History Institute, Carlisle Barracks, Pa in their Manuscript Archive

Here is what they hold in their unit bibliography

U.S. Army Military History Institute
950 Soldiers Drive
Carlisle Barracks, PA 17013-5021
29 Jun 2012

7th Texas Infantry Regiment

Confederate Military History, Extended Edition. Vol. 15: Texas. Wilmington, NC: Broadfoot, 1989.
E484.C65.1987v15. (Contains numerous, scattered references to Texas units).

Crute, Joseph H., Jr. Units of the Confederate States Army. Midlothian, VA: Derwent, 1987.
p. 327 . E546.C78. (Concise summary of the regiment's service).\

Fitzhugh, Lester N. Texas Batteries, Battalions, Regiments, Commanders and Field Officers,
Confederate States Army, 1861-1865. Midlothian, TX: Mirror, 1959. pp. 27-28. E580.3.F5. (List of officers).

Lundberg, John R. Granbury’s Texas Brigade: Diehard Western Confederates. Baton Rouge: LSU,
2012. 321 p. E580.5.G7.L86.

McCaffrey, James M. This Band of Heroes: Granbury's Texas Brigade, C.S.A. Austin, TX: Eakin,
1985. 262 p. E590.5.G7.M33.

Newsom, James L. "Intrepid Gray Warriors: The 7th Texas Infantry, 1861-1865." PhD. dss, TX
Christian, 1995. 246 p. E580.5.7thN49.

Sifakis, Stewart. Compendium of the Confederate Armies: Texas. NY: Facts on File, 1995.
pp. 117-18. E580.S53. (Unit organizational history).

Surles, Russell, editor. "'I Fear...We Must Go Up': With a Confederate Inside Port Hudson."
[R.W. Ford] Civil War Times Illustrated (Feb 1987): pp. 30-39. Per.

Wright, Marcus J., compiler. Texas in the War, 1861-1865. [Edited by Harold B. Simpson]
Hillsboro, TX: Hill Junior College Press, 1965. E580.9.W7. (Contains numerous references to Texas units).

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

Dwight, Henry O. - CWDocColl
Ford, Richard W. – CWTIColl
Gregg, John - CWDocColl
Smith, Fred – CWTIColl