http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Bulletin No. 1249 Trends in Output per Man-Hour in the Private Economy, 1909-1958
Labor Statistics Bureau bulletin 1249; Trends in output per man-hour in private economy, 1909-1958
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ProQuest U.S. Serial Set Digital Collection