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: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Correlates of War Project: International and Civil War Data, 1816-1992 (ICPSR 9905) Singer, J. David; Small, Melvin 2. Correlates of War Project: Militarized Interstate Dispute (MID) Data, 1816-2001 (ICPSR 24386) Diehl, Paul; Geller, Daniel; Gibler, Doug; et al.