Sources:
The Storm Prediction Center
January 1989 Storm Data Publication
NCDC Storm Events Database Entry-Wabash County (IL)
NCDC Storm Events Database Entry-Knox County (IN)
Google Earth
Grazulis, Thomas P. (1993). Significant Tornadoes 1680-1991: A Chronology and Analysis of Events. St. Johnsbury, VT: The Tornado Project of Environmental Films. Page 1285.
Grazulis, T. P. (2001). F5-F6 Tornadoes. United States: Tornado Project.
“Memoirs of Effort to Unlock the Mystery of Severe Storms during the 50 Years, 1942-1992,” by Fujita, T. Theodore, Wind Research Laboratory Research Paper Number 239, 1994. https://swco-ir.tdl.org/handle/10605/262046
Illinois Emergency Services and Disaster Agency videos
January 8, 1989, Evansville Press
January 9, 1989, Daily Republican Register
January 9, 1989, Muncy Evening Press
January 9, 1989, The Daily Dispatch (Mollie IL)
January 10, 1989, Daily Republican Register
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