Hi, I have not actually read the original books, I have read summaries on them to compare with Wicked, which I have read. I recently came across a film called "The Witches of Oz" the makes a really big deal about the grimmery (however, its spelled). Now as far as I know, the grimmery is an idea introduced by Maguire, but I'm not really sure if this is the case. I was hoping someone could clarify for me whether Baum's books actually mention the grimmery or some sort of book of spells that is equivalent to the grimmery. thank you, dn.