Employment and Earnings Statistics for the United States, 1909-60 : Bulletin of the United States Bureau of Labor Statistics, No. 1312
United States. Bureau of Labor Statistics. "Employment and Earnings Statistics for the United States, 1909-60 : Bulletin of the United States Bureau of Labor Statistics, No. 1312," Employment and Earnings, United States (1961). https://fraser.stlouisfed.org/title/189/item/522859, accessed on April 19, 2024.