With Tuesday's school shooting in Oregon, look back at other major school shootings in U.S. history.
Dec. 1, 1997: Three students were killed and five wounded at West Paducah High School in West Paducah, Ky. Michael Carneal, then 14, later pleaded guilty but mentally ill to murder and is serving life in prison.
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U.S. National Archives
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U.S. Air Force
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