United States. Bureau of Labor Statistics. Indexes of Output Per Man-Hour, Selected Industries : Bulletin of the United States Bureau of Labor Statistics, No. 1827.
Washington, D.C:
U.S. Dept. of Labor, Bureau of Labor Statistics,
1974, https://fraser.stlouisfed.org/title/5179,
accessed on April 15, 2025.
@FedFRASER