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book cover of 

Challenge of the Unknown

Challenge of the Unknown

(Book 32 in the Perry Rhodan series)
A novel by

Used availability for Clark Darlton's Challenge of the Unknown

See all available used copies of this book at Abebooks UK or Abebooks US

Paperback Editions

March 1978 : UK Paperback
thumbTitle: Challenge of the Unknown (Perry Rhodan)
Author(s): Clark Darlton
ISBN: 0-7088-8003-7 / 978-0-7088-8003-6 (UK edition)
Publisher: Futura Publications
Availability: Amazon   Amazon UK   Amazon CA   

October 1973 : USA Mass Market Paperback
thumbTitle: Challenge of the Unknown (Perry Rhodan #32)
Author(s): Clark Darlton
ISBN: 0-441-66015-0 / 978-0-441-66015-5 (USA edition)
Publisher: Ace
Availability: Amazon   Amazon CA   

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