The Oz books form a book series that begins with The Wonderful Wizard of Oz, and that relates the "history" of the Land of Oz. Oz was originally created by author L. Frank Baum, who went on to write...
Barsoom is a fictional version of the planet Mars invented by author Edgar Rice Burroughs for a series of action adventure stories. In 1911, Burroughs, now better known as the creator of the character...