Study Search Results Your query returned 2 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded (?) Study Title/Investigator 1. National Senior Citizens Survey, 1968 (ICPSR 7626) Schooler, Kermit 2. Quality of American Life, 1971 (ICPSR 3508) Campbell, Angus; Converse, Philip E.; Rodgers, Willard L.