Indexes of Output per Man-Hour: Selected Industries, 1939 and 1947-70 : Bulletin of the United States Bureau of Labor Statistics, No. 1692
United States. Bureau of Labor Statistics. "Indexes of Output per Man-Hour: Selected Industries, 1939 and 1947-70 : Bulletin of the United States Bureau of Labor Statistics, No. 1692," Productivity Measures for Selected Industries (1971). https://fraser.stlouisfed.org/title/4825/item/498758, accessed on March 29, 2024.