Grampa in Oz

Grampa in Oz (1924) is the eighteenth book in the Oz series created by L. Frank Baum and his successors, and the fourth written by Ruth Plumly Thompson. Unlike in Baum's books, Grampa in Oz presents a kingdom in Oz that has a monetary economy, and is on the verge of economic collapse. It was followed by The Lost King of Oz (1925).