Study Search Results Your query returned 5 results. Series results are grouped under the most relevant study. You can ungroup series results. Use the search box below to revise your search, or start a new search. 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. Great Plains Population and Environment Data: Agricultural Data, 1870-1997 [United States] (ICPSR 4254) Gutmann, Myron P. 1 more results in Great Plains Population and Environment Data Series 2. Historical, Demographic, Economic, and Social Data: The United States, 1790-2002 (ICPSR 2896) Haines, Michael R.; Inter-university Consortium for Political and Social Research 3. Puerto Rico Census Project, 1910 (ICPSR 4343) Palloni, Alberto; Winsborough, Halliman H.; Scarano, Francisco 4. Puerto Rico Census Project, 1920 (ICPSR 4344) Palloni, Alberto; Winsborough, Halliman H.; Scarano, Francisco 5. Southern Farms Study, 1860 (ICPSR 7419) Parker, William N.; Gallman, Robert E.