Statistics for occurrence #1 of “R. A. Brock, Esq.” in chapter 2, section c.2.8, page 77 of Southern Historical Society Papers, Volume 18.:
..., and, as far as I know, neither it nor the article in the Petersburg Index has ever been republished.
I have never read Pollard's book, I am sorry to say.
Yours very sincerely, James H. Lane. R. A. Brock, Esq.
...