Ruth Plumly Thompson

The Hungry Tiger of Oz is the twentieth in the series of Oz books created by L. Frank Baum and his successors, and the sixth written by Ruth Plumly Thompson. It was Illustrated by John R. Neill.

Jack Pumpkinhead of Oz is the twenty-third of the series of Oz books created by L. Frank Baum and continued by other writers; it is the ninth Oz book written by Ruth Plumly Thompson. It was Illustrated by John R. Neill.

The Gnome King of Oz is the twenty-first in the series of Oz books created by L. Frank Baum and his successors, and the seventh by Ruth Plumly Thompson. Like nineteen of the twenty previous books, it was illustrated by John R. Neill.