| | Wizard of Oz - Frequently Asked Questions - The Oz Books (Site not responding. Last check: 2007-10-31) |
 | | These instances are The Royal Book of Oz before The Yellow Knight of Oz, Kabumpo in Oz before The Purple Prince of Oz, Pirates in Oz before Captain Salt in Oz, The Purple Prince of Oz before The Silver Princess in Oz, and The Wonder City of Oz before The Scalawagons of Oz. |
 | | (These additional books by "official" Oz authors and illustrators are discussed in sections 6 and 7.) Also, since 1956, when the copyright on The Wizard of Oz expired in the United States and the characters entered the public domain, a number of other authors have written and published Oz books outside of the regular series. |
 | | While The Wizard of Oz couldn't be found on the shelves of the Chicago library system as early as 1928, two of the most notorious incidents took place in the 1950s, when Senator Joseph McCarthy was chairman of the House Un-American Activities Committee and saw Communism in all walks of life. |
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