Search Results Use the search box below to revise your search, or start a new search. Studies (6) 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: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Aging of Veterans of the Union Army: Military, Pension, and Medical Records, 1820-1940 (ICPSR 6837) Fogel, Robert W., et al. 4 more results in Civil War Veterans Series 2. Old Age in the United States, 1880 (ICPSR 8427) Jensen, Richard; Smith, Daniel Scott; Friedberger, Mark W.; et al.