Search Results Use the search box below to revise your search, or start a new search. Studies (1) Variables Publications Your query returned 1 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. Old Age in the United States, 1900 (ICPSR 8428) Jensen, Richard; Smith, Daniel Scott; Friedberger, Mark W.; et al.