Employment and Earnings Statistics for the United States, 1909-67 : Bulletin of the United States Bureau of Labor Statistics, No. 1312-5
United States. Bureau of Labor Statistics. "Employment and Earnings Statistics for the United States, 1909-67 : Bulletin of the United States Bureau of Labor Statistics, No. 1312-5," Employment and Earnings, United States (1967). https://fraser.stlouisfed.org/title/189/item/522864, accessed on April 19, 2024.