I read the one by Professor Robertson, I guess it was ok, I didn't really get any great feeling from it, try as I would. There is another by Hassler which I actually have but have never read. Poor A. P. Hill didn't get as many books as the others, he seems to have been more private, then also his personal papers got burned or something, so that may account for the lack of books about him. I did read an account where Hassler gave a speech kind of questioning the diagnosis that Hill's medical problem was caused by venereal disease, (which Robertson had a doctor supposedly make a diagnosis 140 years after the fact.)