Bill Cosby's "Little Bill Books" series is among those making the American Library Association's annual top 10 "challenged books." Here's a look at the rest of the list.

The ALA defines a challenge as "an attempt to remove or restrict materials, based upon the objections of a person or group." Books that have been on the list include Harper Lee's "To Kill a Mockingbird," J.K. Rowling's "Harry Potter" series and Maya Angelou's "I Know Why the Caged Bird Sings."

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