Publisher:Sphere
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Thomson Books founded the Sphere paperback imprint in 1966. In 1985 Thomson Books sold Hamish Hamilton, Michael Joseph, Sphere Books, Rainbird Publishing Group and TBD Book Service to Pearson-controlled Penguin. In 1989 Robert Maxwell bought Sphere Books from Pearson's Penguin for £13.75m.
Common ISBN Ranges:
- 07221 1970-1990 (Then taken over by Orbit)
- 074740 1988-1989 (Later used by Orbit)