Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Gun Density, Gun Type, and the Dallas Homicide Rate, 1980-1992 (ICPSR 3145) Koper, Christopher S. 2. National Opinion Survey of Crime and Justice, 1995 (ICPSR 6720) Flanagan, Timothy J.; Longmire, Dennis R.