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Howard R. Garis was one of the most prolific writers of children's literature during the first decades of the 20th century. Many of these were science fiction, such as his "Great Marvel Series", written as by Roy Rockwood. Inspired by the experiments of Max Valier, Garis devoted the Rocket Rider series to depicting rocket propulsion employed by many different vehicles, from aircraft to sleds. Sadly, his explanation of how rockets work is wrong in every book!