There are two Swedish editions of this novel, one from 1972 and one from 1975. Both contains the same translation, supposedly done by a "Jonas Norén", which is actually an alias for Sam J Lundwall, then editor of the book series in which the book was included, later Swedish sf grandmaster. http://www.jules-verne.dk/svdelta.html http://www.lysator.liu.se/~unicorn/fandom/fanzines/fandboken/0.91.txt