““When Children of Dune came out in hardback in 1976, it was an instant best seller. True to the prediction of David Hartwell and the gut feeling of my father, it became the top-selling hardback in science fiction history up to that time . . . more than 100,000 copies in a few months. When the novel came out in paperback the following year, Berkley Books initially printed 750,000 copies. That wasn’t half enough, and they went back to press. Six months after the release of the paperback, Dad said paperback sales were approaching two million copies.””
