Not All School Shootings are the Same and the Differences Matter
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This paper examines student exposure to school shootings in the United States since the 1999 shooting at Columbine High School. We analyze shootings that occurred during school hours on a school day and resulted in a death. These shootings are likely to be uniformly reported and have a greater
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美国国家经济研究局创建时间：
2020-02-01
