Interesting details about the book's various iterations, analysis, reactions, and deleted and changed content, as well as links to the full text of two missing chapters - "Spotty Powder" and "Fudge Mountain" - are posted at
Wikipedia>>Charlie and the Chocolate Factory>>Lost Chapters.
Another interesting read is Symon, Evan V. (January 14, 2013). "
10 Deleted Chapters that Transformed Famous Books" . listverse.com.