Study Search Results Your query returned 2 results. Series results are grouped under the most relevant study. You can ungroup series results. Use the search box below to revise your search, or start a new search. Results per page: 25 50 100 Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Most Downloaded (?) Study Title/Investigator 1. National Black Politics Study, 1993 (ICPSR 2018) Dawson, Michael; Brown, Ronald; Jackson, James S. 2. National Politics Study, 2004 (ICPSR 24483) Jackson, James S.; Hutchings, Vincent L.; Brown, Ronald; et al.