World Vital Records has recently added the Unpublished Roll of Honor by Mark Hughes to its subscription site. This book is an addition to the 27 volume Roll of Honor (link leads to Nos. I - VI) compiled by the U.S. Quartermaster's Department 1865-1871. The first compilation was "a listing of the names of over 300,000 Union soldiers buried in national cemeteries, garrison cemeteries, soldiers' lots, and private graveyards, more than two-thirds of the men having been disinterred from their original burial sites on or near the various battlefields." [Description on Genealogical.com website.]
The Unpublished Roll of Honor includes "records of national cemeteries omitted from the original series, records of headstone requests (often for soldiers who were buried in private cemeteries), and records of post cemeteries that eluded the original compilers. All told, something like 8,500 men are listed here with (usually) their rank, company, and unit. The data is arranged by state and therein alphabetically by cemetery, and all names are conveniently listed in the index." [Description on World Vital Records website.]
Oh, FYI: Ancestry.com has this database included in their subscription service also. An interesting note, however, is the discrepancy in the numbers of names that seem to be included in this source. Per the description on the WVR website (see above), there are "something like 8,500 men" listed. Ancestry's database has a "name count estimate" of 5,746... Go figure. I'm just a messenger on this one.
Why is this being mentioned on the Southern Graves blog? The Table of Contents show there are soldiers buried in Alabama, Arkansas, Florida, Georgia, and more southern states included in the book. An example: on page 27 are listed a couple of soldiers, A. K. Ostrem and Elijah Warren, who died in Macon, GA after the Civil War. In 1873, their bodies were moved to Andersonville National Cemetery.