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. Intergovernmental Organization Data, 1816-1964 (ICPSR 5520) Wallace, Michael; Singer, J. David 2. International Governmental Organizations: Memberships and Characteristics, 1981 and 1992 (ICPSR 6737) Jacobson, Harold K.