Frank Baum 
The Emerald City of Oz 

With 16 color illustrations. 'Wherein is recorded the Perilous Quest of Prince Inga of Pingaree and King Rinkitink in the Magical Isles that lie beyond the Borderland of Oz’. The Oz series includes: 1 The Wizard of Oz, 2 The Land of Oz, 3 Ozma of Oz, 4 Dorothy and the Wizard in Oz, 5 The Road to Oz, 6 The Emerald City of Oz, 7 The Patchwork Girl of Oz, 8 Tik-Tok of Oz, 9 The Scarecrow of Oz, 10 Rinkitink in Oz, 11 The Lost Princess of Oz, 12 The Tin Woodman of Oz, 13 The Magic of Oz, and 14 Glinda of Oz. According to Wikipedia: 'Lyman Frank Baum (1856 – 1919) was an American author, poet, playwright, actor and independent filmmaker, best known today as the creator, along with illustrator W. W. Denslow, of one of the most popular books in American children’s literature, The Wonderful Wizard of Oz, better known now as simply The Wizard of Oz. He wrote thirteen sequels, nine other fantasy novels, and a plethora of other works (55 novels in total, 82 short stories, over 200 poems, an unknown number of scripts, and many miscellaneous writings), and made numerous attempts to bring his works to the stage and screen.’