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 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. Negro Political Attitudes, 1964 (ICPSR 7002) Marx, Gary T.