CONGRATULATIONS TO Happy54 for First to Find!
Mystery-type cache at Ruth Cemetery, Ruth, Mississippi. Cache is NOT at posted coordinates, but is accessible from outside the fence, so you're not restricted to when you can search for it...IF you can find the information below elsewhere (findagrave.com is your friend).
N 31° 22.ABC W 90° 18.DEF
F.L. Clark was born Sept. 17, 18A1.
George W. Guy was born March 2D and died Aug. 7, 1E22.
Malcolm Hardy Reeves was born Oct. 14, 1FCB.
You can validate your puzzle solution with certitude.