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. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. American Identity and Representation Survey, 2012 (ICPSR 36410) Schildkraut, Deborah 2. Longitudinal Study of the Second Generation in Spain (ILSEG) (ICPSR 36286) Portes, Alejandro; Aparicio, Rosa; Haller, William; et al.