The Giant Horse of Oz (1928) is the twenty-second in the series of Oz books created by L. Frank Baum and his successors, and the eighth written by Ruth Plumly Thompson. It was Illustrated by John R. Neill. Summary The Giant Horse of Oz 1928 first printing The tiny kingdom

Jack Pumpkinhead of Oz (1929) 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. Summary Jack Pumpkinhead of Oz 1929 first printing

The Yellow Knight of Oz (1930) is the twenty-fourth in the series of Oz books created by L. Frank Baum and his successors, and the tenth written by Ruth Plumly Thompson. It was illustrated by John R. Neill. Summary Yellow Knight of Oz 1930 first printing Sir Hokus of Pokes

Pirates in Oz (1931) is the twenty-fifth in the series of Oz books created by L. Frank Baum and his successors, and the eleventh written by Ruth Plumly Thompson. It was illustrated by John R. Neill. Summary Pirates in Oz 1931 1st printing Peter returns for a third time, washing

The Purple Prince of Oz (1932) is the 26th in the series of Oz books created by L. Frank Baum and his successors, and the 12th written by Ruth Plumly Thompson. It was illustrated by John R. Neill. Summary The Purple Prince of Oz 1932 first printing While visiting the

Ojo in Oz (1933) is the twenty-seventh in the series of Oz books created by L. Frank Baum and his successors, and the thirteenth written by Ruth Plumly Thompson. It was illustrated by John R. Neill. Summary Ojo in Oz 1933 first printing Ojo (from The Patchwork Girl of Oz)