Hi Peggy,
Have you read "A Southern Record: The History of the Third Regiment Louisiana Infantry" by W. H. Tunnard, I think that Morningside Bookshop may be reprinting the version indexed by Ed Bearss http://www.morningsidebooks.com/cgi/bookshop/home.cgi?vs=home&userid=990370089
There is also a paperback version of this available but I don't think it includes the muster roll and notes.
Also "Life in the Confederate Army: Being the Observations and Experiences of an Alien in the South During the American Civil War" by William Watson is interesting for the early war history of the unit.
Alan Thrower