Study Search Results Your query returned 3 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance (?) Study Title/Investigator 1. Crack, Powder Cocaine, and Heroin: Drug Purchase and Use Patterns in Six Cities in the United States, 1995-1996 (ICPSR 2564) Riley, K. Jack 9 more results in Arrestee Drug Abuse Monitoring (ADAM) Program/Drug Use Forecasting (DUF) Series 2. Project on Human Development in Chicago Neighborhoods (PHDCN): Deviance of Peers, Wave 2, 1997-2000 (ICPSR 13615) Earls, Felton J.; Brooks-Gunn, Jeanne; Raudenbush, Stephen W.; et al. 10 more results in Project on Human Development in Chicago Neighborhoods (PHDCN) Series 3. Sexual Acquisition and Transmission of HIV Cooperative Agreement Program (SATHCAP), 2006-2008 [United States] Restricted Use Files (ICPSR 29181) Iguchi, Martin Y.; Berry, Sandra H.; Ober, Allison J.; et al.