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Podkayne Of Mars (original 1963; edition 1982)
Podkayne of Mars by Robert A. Heinlein (1963)
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Wikipedia in English (1)
While accompanying their uncle, a wily politician, on a trip from Mars to Earth, Podkayne and her brilliant but pesky younger brother are caught up in a plot to keep Uncle Tom from an important conference.
(summary from another edition)
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