There were some biographies on the main characters in the coffee table book - I don't have my copy of the book with me at the moment but that seems a likely source for that kind of esoteric detail.
Glad you asked. I may have bought the wrong thing off Amazon, but what I received is a 6x6" 50-page "Special Preview Edition" of "The Sopranos - The Complete Book".
Edit: Yeah looks like I bought the wrong thing.
Meant to get this.