Colossus 1980, Berkley Books

ISBN-13: 9780425043295

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Colossus 1978, Berkley Books

ISBN-13: 9780425039809

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Colossus 1977, Berkley Books

ISBN-13: 9780425037881

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Colossus 1976, Berkley Books

ISBN-13: 9780425032299

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Colossus 1968, Macmillan, London

ISBN-13: 9780330021104

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Colossus 1967, Berkley Pub. Corp., New York

ISBN-13: 9780425018408

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Colossus 1966, HarperCollins Distribution Services

ISBN-13: 9780246643452

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