The Rocket Ship Galileo reference article from the English Wikipedia on 24-Apr-2004
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Rocket Ship Galileo

Helping orphans the way you would do it
Rocket Ship Galileo is a science fiction novel by Robert Heinlein in which boys build a rocket ship in their backyard and take it to the moon. Okay, they actually finish it out in the desert, and a grown-up helps them. But they find Nazis on the moon! It was published in 1947.