Hi Stuart,
My wife and I have a book on the 4th La. Battn. that is being released in March of this year by McFarland & Company Publishers, Inc. entitled, "The Fourth Louisiana Battalion in the Civil War: A History and Roster." It includes numerous photographs, letters, diaries, etc. of the men of the battalion that you may find helpful. Please feel free to email me at: La27Infantry@wmconnect.com if I can be of any assistance to you in your project.
Sincerely,
Terry G. Scriber