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. Electoral and Demographic Data, 1848-1876: Massachusetts (ICPSR 8242) Baum, Dale 2. White Attitudes Toward Black Civil Equality in the Nineteenth Century: Iowa's Equal Rights Referenda of 1857, 1868, and 1880 (ICPSR 4284) Dykstra, Robert R.