American Library Association, Office of Intellectual Freedom Statistics  Between 1990 and 2000, of the 6,364 challenges reported to or recorded by the Office for Intellectual Freedom (see The 100 Most Frequently Challenged Books): The 100 Most Frequently Challenged BooksThe 100 Most Frequently Challenged Books  1,607 were challenges to sexually explicit material (up 161 since 1999);  1,427 to material considered to use offensive language ; (up 165 since 1999)  1,256 to material considered unsuited to age group ; (up 89 since 1999)
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