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Space Family Stone (original 1952; edition 1971)
The Rolling Stones by Robert A. Heinlein (1952)
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Wikipedia in English (1)
Amazon.com Product Description (ISBN 034532451X, Mass Market Paperback)When the Stone twins made up their minds to leave Lunar City in a secondhand spaceship, they hadn't planned on having their whole family accompany them. But the Stones were not your ordinary Lunar family -- no way! -- and their voyage through the solar system sure proved it.
What began as a simple business expedition to Mars soon mushroomed into a dangerous situation when Grandma Stone was lost in space. Then, just when everything seemed to be getting better, a Martian flatcat came aboard and fouled up the works.
But the real trouble didn't get underway until the Stones headed for the asteroid belt to take up a mining proposition they, somehow, couldn't refuse . . .
(retrieved from Amazon Thu, 12 Mar 2015 18:09:45 -0400)
Though it doesn't seem likely for twins to have the same middle name, it's clear that Castor and Pollux Stone both have 'Trouble' in that spot on their birth certificates. Anyone who's met their grandmother Hazel will know they came by it honestly.
(summary from another edition)
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