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"3. 1917 (551 deaths): Illinois' 3rd largest tornado disaster on record occurred on May 26, 1917, and it accounted for approximately 18% of tornado-related deaths for the year. 101 people were killed across central Illinois, most of them in the Mattoon/Charleston area. It was believed to be a single tornado that extended from Louisiana, Missouri, across portions of Illinois and Indiana and ending the Mount Vernon, IN, but it was later determined to be 4-8 separate tornadoes."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.wgal.com/article/15-deadliest-tornado-years-in-u-s-history/6148912>