Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Center for Education and Drug Abuse Research (CEDAR): Etiological and Prospective Family Study in Southwestern Pennsylvania, Baseline Data, 1990-2011 (ICPSR 33444) Tarter, Ralph E. 2. Project on Human Development in Chicago Neighborhoods (PHDCN): Service Use, Wave 2, 1997-2000 (ICPSR 13656) Earls, Felton J.; Brooks-Gunn, Jeanne; Raudenbush, Stephen W.; et al. 3. National Comorbidity Survey: Adolescent Supplement (NCS-A), 2001-2004 (ICPSR 28581) Kessler, Ronald C.