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. Collaborative Multi-racial Post-election Survey (CMPS), 2008 (ICPSR 35163) Barreto, Matt; Frasure-Yokley, Lorrie; Hancock, Ange-Marie; et al. 2. Negro Political Attitudes, 1964 (ICPSR 7002) Marx, Gary T. 3. Union Army Recruits in Black Regiments in the United States, 1862-1865 (ICPSR 9426) Metzer, Jacob; Margo, Robert A.