The Georgia United Daughters of the Confederacy published just a few years ago a multi-volume set of hard bound books called "Confederate Graves Roster" and the volumes are divided into counties alphabetically and then by cemetery. Within the cemetery list is the company, regiment, state and dates on the stone. This includes all soldiers regardless of state.
This set of books can usually be found in the larger libraries with a Genealogical Section.
I hope this helps.
Gerald D. Hodge, Jr.
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment