http://web.archivep75mbjunhxc6x4j5mwjmomyxb573v42baldlqu56ruil2oiad.onion/web/20250407134612/https:/www.ala.org/bbooks/book-ban-data
In some circumstances, books have been preemptively excluded from library collections, taken off the shelves before they are banned, or not purchased for library collections in the first place. The Office for Intellectual Freedom compiles data on book challenges from reports by library professionals in the field and from news stories published throughout the United States.