Search Results Use the search box below to revise your search, or start a new search. Studies (3) Variables Publications Your query returned 3 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. New Orleans Slave Sale Sample, 1804-1862 (ICPSR 7423) Fogel, Robert W.; Engerman, Stanley L. 2. Philadelphia Social History Project: Pennsylvania Abolition Society and Society of Friends Manuscript Census Schedules, 1838, 1847, 1856 (ICPSR 3805) Hershberg, Theodore 3. Puerto Rico's Padrones, 1779-1802 (ICPSR 30262) Scarano, Francisco A.; Curtis, Katherine J.