Oz
15. The Royal Book of Oz (1921)
16. Kabumpo in Oz (1922)
17. The Cowardly Lion of Oz (1923)
18. Grampa in Oz (1924)
19. The Lost King of Oz (1985)
20. The Hungry Tiger of Oz (1926)
21. The Gnome King of Oz (1927)
22. The Giant Horse of Oz (1928)
23. Jack Pumpkinhead of Oz (1929)
24. The Yellow Knight of Oz (1930)
25. Pirates in Oz (1931)
26. The Purple Prince of Oz (1932)
27. Ojo in Oz (1933)
28. Speedy in Oz (1934)
29. The Wishing Horse of Oz (1929)
32. The Silver Princess in Oz (1938)
33. Ozoplaning With the Wizard of Oz (1939)