I remember reading Marley Cole's _Jehovah's Witnesses - The New World Society_ many years ago. The first time I saw the title of the book was on a literature servant's WTBTS literature price list back in 1973 during my brief association. The book was published by Vantage Press, a vanity publisher paid in full by the WTBTS. I was told by a ministerial servant that the WTBTS deliberately hid its sponsorship so that the publishers would have a book to place in households where any official WTBTS literature was unwelcome. (Just another instance of theocratic information warfare.) To my knowledge, the book was never distributed to bookstores for sale, but may have been placed in public libraries as donations by JWs acting as agents of the WTBTS.
I remember that the book had a relatively long chapter on the Miracle Wheat scandal that was much more revealing than anything officially published by the WTBTS. It seems like a rebuttal of sorts, but I had not read _Thirty Years a Watchtower Slave_ so I didn't know who they were rebutting.