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. Midlife Development in the United States (MIDUS): Psychological Experiences Follow-Up Study, 1998 (ICPSR 2911) Wethington, Elaine; Kessler, Ronald C.; Brim, Orville G. 1 more results in Midlife Development in the United States (MIDUS) Series 2. Social Networks in Adult Life, 1980: [United States] (ICPSR 9254) Kahn, Robert L.; Antonucci, Toni C.