A few more that may be of interest:

Gettysburg as the Generals Remembered It by Robert P. Broadwater

The Slaves' War: The Civil War in the Words of Former Slaves by Andrew Ward

Mary Chesnut's Civil War by Mary Boykin Chesnut, C. Vann Woodward (editor)

The last will be familiar to you if you have ever seen the excellent videos series, The Civil War by Ken Burns