1. The Wonderful Wizard of Oz (1900) by L Frank Baum
2. The Marvelous Land of Oz (1904) by L Frank Baum
     aka The Land of Oz
3. Ozma of Oz (1907) by L Frank Baum
4. Dorothy and the Wizard of Oz (1908) by L Frank Baum
5. The Road to Oz (1909) by L Frank Baum
6. The Emerald City of Oz (1910) by L Frank Baum
7. The Patchwork Girl of Oz (1913) by L Frank Baum
8. Tik-Tok of Oz (1914) by L Frank Baum
9. The Scarecrow of Oz (1915) by L Frank Baum
10. Rinkitink in Oz (1916) by L Frank Baum
11. The Lost Princess of Oz (1917) by L Frank Baum
12. The Tin Woodman of Oz (1918) by L Frank Baum
13. The Magic of Oz (1919) by L Frank Baum
14. Glinda of Oz (1920) by L Frank Baum
15. The Royal Book of Oz (1921) by Ruth Plumly Thompson
16. Kabumpo in Oz (1922) by Ruth Plumly Thompson
17. The Cowardly Lion of Oz (1923) by Ruth Plumly Thompson
18. Grampa in Oz (1924) by Ruth Plumly Thompson
The Hidden Valley of Oz (1951) by Rachel Cosgrove Payes
19. The Lost King of Oz (1985) by Ruth Plumly Thompson
20. The Hungry Tiger of Oz (1926) by Ruth Plumly Thompson
21. The Gnome King of Oz (1927) by Ruth Plumly Thompson
22. The Giant Horse of Oz (1928) by Ruth Plumly Thompson
23. Jack Pumpkinhead of Oz (1929) by Ruth Plumly Thompson
24. The Yellow Knight of Oz (1930) by Ruth Plumly Thompson
25. Pirates in Oz (1931) by Ruth Plumly Thompson
26. The Purple Prince of Oz (1932) by Ruth Plumly Thompson
27. Ojo in Oz (1933) by Ruth Plumly Thompson
28. Speedy in Oz (1934) by Ruth Plumly Thompson
29. The Wishing Horse of Oz (1929) by Ruth Plumly Thompson
32. The Silver Princess in Oz (1938) by Ruth Plumly Thompson
33. Ozoplaning With the Wizard of Oz (1939) by Ruth Plumly Thompson
How the Wizard Came to Oz (1991) by Donald Abbott
The Nome King's Shadow in Oz (1992) by Donald Abbott and Gilbert M Sprague
The Wicked Witch of Oz (1993) by Rachel Cosgrove Payes
The Magic Chest of Oz (1993) by Donald Abbott
Father Goose in Oz (1994) by Donald Abbott
The Speckled Rose of Oz (1995) by Donald Abbott
How the Wizard Saved Oz (1996) by Donald Abbott
The Amber Flute of Oz (1998) by Donald Abbott