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Warning Signs: Identifying School Shooters Before They Strike — Now available as an audiobook

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The Influence of Columbine (tabloid format) (version 1.3) [1 p, 409 Kb]

This 11-by-17-inch version of the diagram features a compact representation of the lines of influence between perpetrators.

Related to Incident: 
Columbine High School

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Last update: 14 March 2023