The books I listed were just the ones that Baum wrote. There have been many others as well.
I am mad they are going to remake the classic “Poltergeist”. Not quite up there Wizard of Oz, but still a sci-fi\horror classic. This Wizard of Oz is a stupid idea,will fail and barely make the the probable 250 million dollar budget back. Zemekis would be wise to run not walk from this idea. A Lord of the Rings prequel, smart, same director, same chemistry. But when Tina Fey and Steven Colbert qualify as “Brilliant” Hollywood writing talent, what are you left with.