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. Annual Alliance Membership Data, 1815-1965 (ICPSR 5602) Singer, David J.; Small, Melvin 2. Correlates of War Project: Militarized Interstate Dispute (MID) Data, 1816-2001 (ICPSR 24386) Diehl, Paul; Geller, Daniel; Gibler, Doug; et al.