Any help on these units mention appreciated, need research material. NARA?????

See article "Negro Soldiers in the Confederate Army" by John A. Minion.

https://books.google.com/books?id=H7ttGoZ5KkEC&pg=PA231&lpg=PA231&dq=black+volunteers+in+a+Mississippi+militia&source=bl&ots=t-bqATR1EP&sig=AXIR-406VKGDWPE1SU-Y6LToK6s&hl=en&ei=UoX0TMifAsT6lweNpLXmBQ&sa=X&oi=book_result&ct=result&resnum=1&ved=0CBMQ6AEwAA#v=onepage&q=black%20volunteers%20in%20a%20Mississippi%20militia&f=false