Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Comparative Study of Intergovernmental Organizations, l970-1971 (ICPSR 7385) Lopez, George A.; Stern, Jean M. 2. Intergovernmental Organization Data, 1816-1964 (ICPSR 5520) Wallace, Michael; Singer, J. David 3. National Memberships in International Nongovernmental Organizations, 1966 (ICPSR 5502) Baldwin, Burt R.