Ha, that is the one I have been very focused on for two weeks now. Give me your e-mail address and I can save you tons of time. I have found an unbelievable amount of info there. I mean truly unbelievable.
Also, I am looking for researchable archives of the "Memphis Daily Appeal" which, as you may know, escaped Memphis when the Yanks took over, with their equipment, and followed the various Confederate armies across the south. There are some very good accounts of the PCA in those papers.