Study Search Results Your query returned 2 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. (?) Study Title/Investigator 1. County Characteristics, 2000-2007 [United States] (ICPSR 20660) Inter-university Consortium for Political and Social Research 2. Great Plains Population and Environment Data: Biogeochemical Modeling Data, 1860-2003 [United States] (ICPSR 31681) Parton, William J.; Gutmann, Myron P.; Hartman, Melannie D.; et al.