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Nightmare Factor 1979, Macmillan, London

ISBN-13: 9780330257794

Paperback

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The Nightmare Factor 1978, Doubleday Books, Garden City, NY

ISBN-13: 9780385114622

Hardcover

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Nightmare Factor 1978, Hodder & Stoughton Ltd, London

ISBN-13: 9780340227824

Hardcover

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