Home › Authors › Thomas P. Grazulis 👤 Thomas P. Grazulis 3 books Books by Thomas P. Grazulis Significant Tornadoes 1680-199 Significant Tornadoes 1680-1991/a Chronology and Analysis of Events 1993 Significant Tornadoes, Vols. 1 Significant Tornadoes, Vols. 1 & 2 1991 Significant Tornadoes, 1880-19 Significant Tornadoes, 1880-1989 1990