Indexes of Output per Man-Hour: Selected Industries, 1939 and 1947-68 : Bulletin of the United States Bureau of Labor Statistics, No. 1652
United States. Bureau of Labor Statistics. "Indexes of Output per Man-Hour: Selected Industries, 1939 and 1947-68 : Bulletin of the United States Bureau of Labor Statistics, No. 1652," Productivity Measures for Selected Industries (1969). https://fraser.stlouisfed.org/title/4825/item/498551, accessed on April 24, 2024.