For what its worth, I suspect that N. N. Brockman is buried in the well-kept Confederate Cemetery at Resaca. I do not have my listing for this cemetery before me, but most of the graves there are identified.
As to Privates John T. Page and E. O. Mountain (is this a misprint, or just a horrible coincidence, since he was killed at Kennesaw Mountain?), the great probability is that there are buried in the Confederate cemetery at Marietta, where, I understand, as many as possible of the Confederates killed during this phase of the Atlanta Campaign were reinterred postwar.
As to F. M. Booth, he is, I am sure, buried in the Confederate cemetery at Jonesboro, but unfortunately only one or two of the large number of interments there have their graves marked. I believe the Federals held the field after Jonesboro, and would have buried the Confederate dead in mass groaves, for the most part, and postwar they were then moved to the Confederate cemetery at Jonesboro.
The initials "F. M." frequently stand for "Francis Marion", a very popular name among Civil War era Southerners, particularly those who had some connection to South Carolina. I wonder if that was Booth's given name.