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. Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance 1. Aging of Veterans of the Union Army: Military, Pension, and Medical Records, 1820-1940 (ICPSR 6837) Fogel, Robert W., et al. 2. Aging of Veterans of the Union Army: Surgeons' Certificates, Version S-1 Standardized, 1862-1940 (ICPSR 3417) Fogel, Robert W., et al.