20 - Steam Man of the Prairies by Edward S. Ellis

Join Ethan Hopkins and Mickey McSquizzle—a Yankee and an Irishman—as they embark on thrilling adventures across the American prairies, encountering a magnificent steam-powered man. This extraordinary creation, built by the clever teenage inventor Johnny Brainerd, serves as both companion and carriage, taking them on a journey filled with excitement and discovery. - Summary by Wikipedia