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The ability to distinguish reality from fantasy is supposedly the root of sanity.

But if a man lives in two worlds, and both are real, what then? Is he mad, or sane? One person, or two? And if one of his worlds should begin to grow dim, a shadow world, could one say he was in danger of going sane?

    

Used availability for Richard Cowper's Breakthrough

Hardback Editions

June 1967 : UK Hardback
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Title: Breakthrough
Author(s): Richard Cowper
ISBN: 0-234-77978-0 / 978-0-234-77978-1 (UK edition)
Publisher: Dobson Books Ltd
Availability: Amazon   Amazon UK   Amazon CA   


Paperback Editions

January 1972 : USA Paperback
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Title: Breakthrough (Ballantine science fiction)
Author(s): Richard Cowper
ISBN: 0-345-01653-X / 978-0-345-01653-9 (USA edition)
Publisher: Ballantine Books Inc.
Availability: Amazon   Amazon UK   Amazon CA   


July 1970 : USA Mass Market Paperback
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Title: Breakthrough
Author(s): Richard Cowper
ISBN: 0-345-21653-9 / 978-0-345-21653-3 (USA edition)
Publisher: Ballantine Books
Availability: Amazon   Amazon UK   Amazon CA   


Kindle Editions

April 2015 : USA, Canada Kindle edition
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Title: Breakthrough
Author(s): Richard Cowper
Publisher: Orion Children's Books
Availability: Amazon   Amazon CA   


April 2015 : UK Kindle edition
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Title: Breakthrough
Author(s): Richard Cowper
Publisher: Gateway
Availability: Amazon UK