L. Frank Baum & L. Frank Baum 
Dorothy and the Wizard in Oz 

It’s no use; no use at all. The children won’t let me stop telling tales of the Land of Oz. I know lots of other stories, and I hope to tell them, some time or another; but just now my loving tyrants won’t allow me. They cry: ’Oz—Oz! More about Oz, Mr. Baum!’ and what can I do but obey their commands?
This is Our Book—mine and the children’s. For they have flooded me with thousands of suggestions in regard to it, and I have honestly tried to adopt as many of these suggestions as could be fitted into one story.