| Author | Frederik Pohl |
| Copyright Holder | Frederik Pohl |
| Imprint | Science Fiction Book Club (2)* |
| Publisher | Readers Union, Readers Union Group Of Book Clubs, Readers Union Ltd |
| First Published by | Victor Gollancz Ltd, Lowe & Brydone Printers Limited |
| Format | Hardback |
| Language | English |
| Location | UK |
| Copyright | 1965 |
| This Edition Published | 1967 |
| Pages / Font | 158 pages |
| Series Number | 123 |