In my youth, the Carden Readers of the third grade were in three parts.  Currently, Carden sells a book titled the Class Book 3. I presume that it is the compilation of all three books; though, I cannot know what other changes have been made. I am keeping them as separate works that represent an evolution of a single work. Some of the Carden Readers, at the time of this writing are being adapted, again, and won't be identical to their original counterparts. Changes have been made and are being made.