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. Events Data for Four International Crises: 1941, 1950, 1962 (ICPSR 7701) Hopple, Gerald W.; Wilkenfeld, Jonathan; Rossa, Paul J.