The Motor Boys over The Rockies, the 10th volume in the series, starts with the boys trying to decide where to go on summer vacation. But they soon discoverthe Comet, their dirigible/airplane has been stolen! Yoicks! What a dastardly deed! Have no fear; our heroes find their air craft and along with Professor Snodgrass, who joins them as the Comet is leaving the groundliterallywestard they go! Hearing of a group of men being held captive in a remote canyon in the Rockies, the boys decide to do the only thing they canrescue them! Easier said than done, they soon learn.
Clarence Young was a Stratemeyer Syndicate pen name. Howard Garis almost certainly wrote the series, although Stratemeyer usually provided his authors with an outline of the books. Garis and his wife, Lillian, wrote many children's books under their own name. They are best known for a series of books that featured the character of Uncle Wiggily Longears, an engaging elderly rabbit. Many of Garis' books were illustrated by Lansing Campbell. Garis and his wife, Lilian Garis, were possibly the most prolific children's authors of the early 20th century. Garis wrote many books for the Stratemeyers Syndicate as well, over a period of some 30 years.