Study Search Results Your query returned 4 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. Height of Free African Americans in Maryland, 1800-1864 (ICPSR 3422) Komlos, John 2. Slave Hires, 1775-1865 (ICPSR 7422) Fogel, Robert W.; Engerman, Stanley L. 1 more results in Economics of American Negro Slavery Series 3. Social Composition of Detroit, 1880-1900 (ICPSR 8200) Zunz, Olivier 4. 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.