series: Economics of American Negro Slavery Series > Study Search Results Your query returned 2 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. Slave Hires, 1775-1865 (ICPSR 7422) Fogel, Robert W.; Engerman, Stanley L. 2. Slave Sales and Appraisals, 1775-1865 (ICPSR 7421) Fogel, Robert W.; Engerman, Stanley L.