Study Search Results Your query returned 3 results. Use the search box below to revise your search, or start a new search. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. (?) Study Title/Investigator 1. Comparison of Older Volunteers and Older Nonvolunteers in the Philadelphia Area, 1993-1998 (ICPSR 20460) Shultz, Norah 2. General Social Survey, 1972-2010 [Cumulative File] (ICPSR 31521) Smith, Tom W.; Marsden, Peter V.; Hout, Michael 3. General Social Survey, 1972-2012 [Cumulative File] (ICPSR 34802) Smith, Tom W.; Hout, Michael; Marsden, Peter V.