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"The Columbine massacre of April 20, 1999, in unincorporated Jefferson County remains the worst mass shooting to have ever taken place at an American high school."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.catholicnewsagency.com/newf.php?url=nurse_shares_lessons_learned_on_suffering_from_columbine/>