Search Results Use the search box below to revise your search, or start a new search. Studies (4) Variables Publications Your query returned 4 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Extended National Assessment Survey of Law Enforcement Anti-Gang Information Resources, 1993-1994 (ICPSR 6565) Curry, G. David; Ball, Richard A.; Decker, Scott H. 2. Impact of Gang Migration: Effective Responses by Law Enforcement Agencies in the United States, 1992 (ICPSR 2570) Maxson, Cheryl L. 3. National Assessment Survey of Law Enforcement Anti-Gang Information Resources, 1990-1991 (ICPSR 6237) Curry, G. David; Fox, Robert J.; Ball, Richard A.; et al. 4. Prevalence of Five Gang Structures in 201 Cities in the United States, 1992 and 1995 (ICPSR 2792) Klein, Malcolm W.; Maxson, Cheryl L.