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Release details

• 1968, USA, New American Library (ISBN 0-453-00269-2), Pub date ? June 1968, hardback (First edition)^[4]
• 1968, USA, Signet, Pub date July 1968, paperback (First paperback edition)^[4]
• 1968, UK, Hutchinson (ISBN 0-09-089830-3), Pub date ? ? 1968, hardback (First British edition)^[4]
• 1968, UK, Arrow Books (ISBN 0-09-001530-4), Pub date ? October 1968, paperback
• 2000, UK, Orbit (ISBN 1-84149-055-5), Pub date 7 December 2000, hardback (special edition)
• 2005, USA, Signet (ISBN 0-451-45273-9), Pub date 31 July 2005, paperback