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. National Study of Law Enforcement Agencies' Policies Regarding Missing Children and Homeless Youth, 1986 (ICPSR 6127) Collins, James J.,; McCalla, Mary Ellen; Powers, Linda L.; et al. 2. Relationship of Mental Disorder to Violent Behavior in the United States, 1983-1984 (ICPSR 9973) Collins, James J.,; Bailey, Susan L.; Phillips, Charles D.; et al.