Randy,
I would be glad to show you around the marietta area. Just give me a call. 770-891-3836. As to the headstones. the only monument in the Mississippi section is that of Capt Stanford [Killed at Resaca, GA] of Stanford's Mississippi Battery. the remaining graves were once marked by wooden markers long since gone. The likelihood of Lewis Stowers being buried at Marietta is slim. the cemetery was started after a train accident in Sept of 1863. Later men were disinterred from the battlefields along the RR line from Atlanta to chattanooga. It is possible that men were also buried there after the war from gravesites all around Atlanta. I have not seen any records indicating burials there as a result of the battles in the Atlanta Canmpaign. (May -Sept 1864), but that does not preclude the possibility.