The UDC at one time made up a list which was lost. Later, a portion of the list was found and published by Gary Webster and subsequently republished. His work shows the grave numbers for a great many.
His latest work was published in 1998 with new data and some input by me is available at the Vickburg Military History Park store.
I'm away from my homebase and at my sister's home in Bellingham, Washington. Yesterday, I could not find other documents related to these burials.
When I return in a week, I'll redouble my search. I believe I posted the URL for the NPS Vicksburg Military Park site that described the Confederate cemetery.