Books can be revised, and have been. Case in point: Curious George. In the original version of 'Curious George Goes to the Hospital', (I have a copy of it in a box somewhere) George breaks his leg. While at the hospital to get his cast, George escapes and finds the storage room where they kept the ether. Gets high. (As a kid, this was hilarious to me.) I saw this book a few years ago, and the plot had been revised to George getting into an innocuous and unmemorable flavor of mischief. I could see the rationale, but I'd be lying if I said I wasn't a little bummed about it. Canceling Dr. Seuss books outright is outrageous.