Go here http://www.itd.nps.gov/cwss/soldiers.cfm
You can find unit history at http://www.mississippiscv.org/mississippi_history.htm
His CSRs can be ordered from this site.
GP
William H. Dickerson (First_Last)
Regiment Name 31 Mississippi Infantry
Side Confederate
Company C
Soldier's Rank_In Private
Soldier's Rank_Out Private
Alternate Name
Notes
Film Number M232 roll 11