Jane,
If you will send me your email address I'll send you the transcribed entries from Dr. Dye's casebook regarding the members of the 28th Texas (including the sketches). The soldiers he treated from the 28th include Stephen H. Oates, Abner Barbee, an individual with the initials "A. B.", R.M. Garrett, and J.M. Hartley. There are also two individuals by the last name of Harvey and Dorsey for which he does not provide a unit designation. These may or may not not have been members of the 28th.
My email address is gurleybillyj@uams.edu
Bill