On Columbine massacre anniversary, bomb, propane tanks found at Colorado mall – Daily Freeman
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High school student who idolizes Columbine killers injures his hand building a bomb at home – New York Daily News
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December 20, 1999: The Columbine Tapes | A History of Violence: Gun Control in the Pages of TIME | TIME.com
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The Columbine Effect: How five teen pastimes got caught in the crossfire and why teens are taking them back: Winegarner, Beth: 9781304431219: Amazon.com: Books
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