Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Series results are grouped under the most relevant study. Ungroup series results to view all results. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Census of Population and Housing, 1980 [United States]: Special Tabulations of Population 60 Years and Over (ICPSR 8533) United States Department of Commerce. Bureau of the Census 2. Union Army Recruits in White Regiments in the United States, 1861-1865 (ICPSR 9425) Fogel, Robert W.; Engerman, Stanley L.; Pope, Clayne; et al.