a lower-cost version in the paperback, is released to sell further copies. In the past the release of a paperback edition was one year after the hardback, but by the early 21st century paperbacks were released six months after the hardback by some publishers. It is very unusual for a book that was first published in paperback to be followed by a hardback. One example is the novel The Judgment of Paris by Gore Vidal, which had its revised edition of 1961 first published in paperback, and later in hardcover.

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