The Complete Collection Wizard of OZ Series 15 Books Collection Box Set By L. Frank Baum

Titles in this Set:
Wizard of Oz Book 1 ( 3 Titles in 1)
The Wonderful Wizard of Oz
The Marvellous Land of Oz
Ozma of Oz

Wizard of Oz Book 2  (3 Titles in 1)
The Emerald City of Oz
The Road to Oz
Dorothy and the Wizard in Oz 

Wizard of Oz Book 3 (3 Titles in 1)
The Patchwork Girl of Oz
Tik-Tok of Oz 
The Scarecrow of Oz

Wizard of Oz Book 4 (3 Titles in 1)
Rinkitink in Oz
The Tin Woodman of Oz
The lost Princess of Oz