U.S. tornadoes : 70-year statistics
T. Theodore Fujita
(SMRP research paper, no. 218)
Satellite and Mesometeorology Research Project, Dept. of the Geophysical Sciences, University of Chicago, c1987
US tornadoes
"National Technical Information Service PB 87-127742"
Includes bibliographical references
Satellite and Mesometeorology Research Project, Dept. of the Geophysical Sciences, University of Chicago