softcover, 62 pages
English language
Published March 8, 1975 by Methuen.
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This "Young Readers" edition in small format adds to the 62-page original (a) a 7-page introduction to the main characters in the story, and (b) a 23-page section on "The real-life inspiration behind Tintin's adventures," by Stuart Tett with the collaboration of Studio Moulinsart.