Study Search Results Your query returned 1 results. Use the search box below to revise your search, or start a new search. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded Variable Relevance (?) Study Title/Investigator 1. Gun Density, Gun Type, and the Dallas Homicide Rate, 1980-1992 (ICPSR 3145) Koper, Christopher S.