Goggle searchs: "22nd Texas Infantry" and "NPS Soldiers and Sailors Sytsem" will provide you a good start.

Later, you might want to check the U. S. Army Military History Institute, Carlisle Barracks, bibliogry unit history files.

Also, the "James River Publishing Company" website has a great listing of regimental information and contacts. Again, a Goggle search will get you there.

George Martin