Study Search Results Your query returned 3 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. Most Downloaded (?) Study Title/Investigator 1. CBS News South Carolina Primary Call-Back Poll, January 2008 (ICPSR 26141) CBS News 1 more results in CBS News/New York Times Poll Series 2. Negro Political Participation Study, 1961-1962 (ICPSR 7255) Matthews, Donald; Prothro, James 3. Union Army Recruits in Black Regiments in the United States, 1862-1865 (ICPSR 9426) Metzer, Jacob; Margo, Robert A.