In the early 1960s, the company engaged in a well-known rivalry with Ace Books for the rights to reprint the works of J. R. R. Tolkien and Edgar Rice Burroughs in paperback form. Ballantine prevailed in the struggle for the Tolkien work, with their editions of Tolkien's "The Lord of the Rings" including a message on the back cover from Tolkien himself urging consumers to buy Ballantine's version and boycott "unauthorized editions" (i.e. the version from Ace Books). A separate Canadian edition of the books was published with different front cover art work. Tolkien asked for (and received) permission to add the back cover message. Betty Ballantine recalled: "And we did put a little statement on the back covers saying that Ace was not paying royalties to Professor Tolkien, and everybody who admired "Lord of the Rings" should only buy our paperback edition. Well, everybody got behind us. There was literally no publication that did not carry some kind of outraged article. And of course, the whole science fiction fraternity got behind the book; this was their meat and drink."