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. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. National Longitudinal Study of Adolescent to Adult Health (Add Health), 1994-2008 [Public Use] (ICPSR 21600) Harris, Kathleen Mullan; Udry, J. Richard 2. State of the First Amendment [1997-2006] (ICPSR 35592) First Amendment Center 3. National Social Survey [United States] (ICPSR 35588) Miringoff, Marque-Luisa; Miringoff, Marc; Opdycke, Sandra; et al.