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. Series results are grouped under the most relevant study. Ungroup series results to view all 2 results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Harlem Longitudinal Study of Urban Black Youth, 1968 United States (ICPSR 121) Brunswick, Ann 2. Iowa Youth and Families Project, 1989-1992 (ICPSR 26721) Conger, Rand D.; Lasley, Paul; Lorenz, Frederick O.; et al.