Higher end estimates by Kleck and Gertz show between 1 to 2.5 million DGUs in the United States each year.
The Great American Gun Debate: Essays on Firearms & Violence (w/ Gary Kleck and John K. Lattimer, gun control, Pacific Research Institute, 1997) ISBN 0-936488-39-5
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Armed: New Perspectives on Gun Control (w/ Gary Kleck, gun control, Prometheus Books, 2001) ISBN 1-57392-883-6
His research was cited in the Supreme Court's landmark District of Columbia v. Heller decision, which struck down the D.C. handgun ban and held that the Second Amendment protects an individual right to keep and bear arms.
In 1991, Gary Kleck and Karen McElrath obtained archival data from 1979-1985 National Crime Surveys and the 1982 Supplementary Homicide Reports.
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