Search Results Use the search box below to revise your search, or start a new search. Studies (1) Variables Publications Your query returned 1 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Nations in Conflict: Data on National Growth and International Violence for Six European Major Powers, 1870-1914 (ICPSR 7425) Choucri, Nazli; North, Robert C.