Supplemental Material for
The Relation Between State Gun Laws and the Incidence and Severity of Mass Public Shootings in the United States, 1976–2018
Michael Siegel 
, Max Goder-Reiser , Grant Duwe , Michael Rocque , James Alan Fox, and
Emma E. Fridel Law and Human Behavior,
Vol.
44,
No.
5,
pp.
347–360
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