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by Arthur C. ClarkeHardcover details (UK). details (USA). details (Germany). details (Canada). ISBN: 978-0-575-02011-5 ISBN-10: 0-575-02011-3  | 
| See also: | ||
| 2005 | Hardcover | Imperial Earth | 
| 2003 | Hardcover | Imperial Earth | 
| 1977 | Paperback | Imperial Earth | 
| 1976 | Hardcover | Imperial Earth | 
| 1976 | Mass Market Paperback | Imperial Earth |