Yes, there was more than one; fourteen to be exact. By reading the books you find out that it was not a dream. Dorothy goes back to Oz many times and ends up living there with Auntie1 Em and Uncle Henry.
I wrote an article about the Real Wicked Witch, comparing the story with the book. You might be surprised to learn that the Wicked Witch in the book does not resemble the character played by actress Margaret Hamilton. In fact, the story of the Wicked Witch takes up only a small part of the book. The Flying Monkeys are not as scary as the ones in the movie either. They have their own story about why they do what they do.
I chose to use the colors black and green to highlight the story. I really liked the way it turned out. So when it was tagged at its previous home on Squidoo for duplicate content (I quote from the book to demonstrate the difference between the movie and the book; all of the Oz books by L. Frank Baum are in the public domain), I took it off-line for awhile and then re-created it here at the Crone's Hut at the Crossroads.
Take a look for yourself. I promise that you won't be scared. Well, maybe just a little.
Shortcut to The Real Story of the Wicked Witch of the West