This is always a fun list to go through. I especially like that even the dictionary has been banned before.
American Heritage Dictionary (1969)
In 1978, an Eldon, Missouri library banned the dictionary because it contained 39 “objectionable” words. And, in 1987, the Anchorage School Board banned the dictionary for similar reasons, i.e., having slang definitions for words such as “bed,” “knocker,” and “balls.”