Study Search Results Your query returned 1 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. (?) Study Title/Investigator 1. 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.