I just checked my copy, and there it is. I remember the day I bought this book off the news stand. How exciting to see Gil's work somewhere other than a Marvel comics. Same this with Steranko's Shadow covers. What a great time that was.
Yes, the paperback sized comic is one of those great unexplored formats. I think it was devised to get distribution through bookstores and was pioneered by those Mad paperbacks. I think Kane was also interested in creating a more text-heavy variation on comics, which is the exact opposite of where comics are now. The small paperback has been abandoned by comics, which have replaced it with manga and digests, but there were a few people in the sixties and seventies that created paperback originals like Harvey Kurtzman, Russ Jones, and Kane. I'd love to see more.
Those "Fiction Illustrated" were fun, even though there were only a few of them. That was Russ Jones, wasn't it?
Those were Byron Preiss. Jones did a paperback of Dracula, drawn by Al McWilliams, and an anthology called Christopher Lee's Treasury of Terror, the contents of which were reprinted in various Warren magazines.