Bryce, here are a few books that deal with the brigade of Harris 1. A Mississippi Rebel in the Army of Northern Virginia (Memoirs of Private David Holt-16th Mississippi)
2. The 16th Mississippi Mississippi Infantry-Civil War Letters and Reminiscences-Compiled and Edited by Robert G. Evans

Joe Davis's Brigade-Duty-Valor-Honor (The Story of the Eleventh Mississippi Infantry Regiment) by Steven H. Stubbs. An excellent book with a full roster.