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Here is the complete list of the Famous Forty Oz books (often shortened to the FF), the ones that most
Oz fans agree are true Oz, and their authors and dates of publication. 

 1.The Wizard of Oz (originally published as The Wonderful Wizard of Oz) (L. Frank Baum, 1900) 
 2.The Land of Oz (originally published as The Marvelous Land of Oz) (L. Frank Baum, 1904) 
 3.Ozma of Oz (L. Frank Baum, 1907) 
 4.Dorothy and the Wizard in Oz (L. Frank Baum, 1908) 
 5.The Road to Oz (L. Frank Baum, 1909) 
 6.The Emerald City of Oz (L. Frank Baum, 1910) 
 7.The Patchwork Girl of Oz (L. Frank Baum, 1913) 
 8.Tik-Tok of Oz (L. Frank Baum, 1914) 
 9.The Scarecrow of Oz (L. Frank Baum, 1915) 
10.Rinkitink in Oz (L. Frank Baum, 1916) 
11.The Lost Princess of Oz (L. Frank Baum, 1917) 
12.The Tin Woodman of Oz (L. Frank Baum, 1918) 
13.The Magic of Oz (L. Frank Baum, 1919) 
14.Glinda of Oz (L. Frank Baum, 1920) 
15.The Royal Book of Oz (Ruth Plumly Thompson [but originally attributed to L. Frank Baum], 1921) 
16.Kabumpo in Oz (Ruth Plumly Thompson, 1922) 
17.The Cowardly Lion of Oz (Ruth Plumly Thompson, 1923) 
18.Grampa in Oz (Ruth Plumly Thompson, 1924) 
19.The Lost King of Oz (Ruth Plumly Thompson, 1925) 
20.The Hungry Tiger of Oz (Ruth Plumly Thompson, 1926) 
21.The Gnome King of Oz (Ruth Plumly Thompson, 1927) 
22.The Giant Horse of Oz (Ruth Plumly Thompson, 1928) 
23.Jack Pumpkinhead of Oz (Ruth Plumly Thompson, 1929) 
24.The Yellow Knight of Oz (Ruth Plumly Thompson, 1930) 
25.Pirates in Oz (Ruth Plumly Thompson, 1931) 
26.The Purple Prince of Oz (Ruth Plumly Thompson, 1932) 
27.Ojo in Oz (Ruth Plumly Thompson, 1933) 
28.Speedy in Oz (Ruth Plumly Thompson, 1934) 
29.The Wishing Horse of Oz (Ruth Plumly Thompson, 1935) 
30.Captain Salt in Oz (Ruth Plumly Thompson, 1936) 
31.Handy Mandy in Oz (Ruth Plumly Thompson, 1937) 
32.The Silver Princess in Oz (Ruth Plumly Thompson, 1938) 
33.Ozoplaning with the Wizard of Oz (Ruth Plumly Thompson, 1939) 
34.The Wonder City of Oz (John R. Neill, 1940) 
35.The Scalawagons of Oz (John R. Neill, 1941) 
36.Lucky Bucky in Oz (John R. Neill, 1942) 
37.The Magical Mimics in Oz (Jack Snow, 1946) 
38.The Shaggy Man of Oz (Jack Snow, 1949) 
39.The Hidden Valley of Oz (Rachel R. Cosgrove, 1951) 
40.Merry-Go-Round in Oz (Eloise Jarvis McGraw and Lauren McGraw Wagner, 1963) 



The Road to Oz; In Which Is Related how Dorothy Gale of Kansas... 

The Wonderful Wizard of Oz

Ozma of Oz: A Record of Her Adventures 
The Marvelous Land of Oz: Being an Account of the Further Adventures of the Scarecrow and Tin Woodman 

The Emerald City of Oz 

Dorothy and the Wizard in Oz 

The Patchwork Girl of Oz 

Tik-Tok of Oz 

The Tin Woodman of Oz 

Rinkitink in Oz 

The Road to Oz 

The Scarecrow of Oz 

The Lost Princess of Oz