book cover of Challenge of the Unknown
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Challenge of the Unknown

(1973)
(Book 32 in the Perry Rhodan series)
A novel by

 
 

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Used availability for Clark Darlton's Challenge of the Unknown

Paperback Editions

October 1973 : USA Mass Market Paperback
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Title: 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