Covered Employment by Industrial Divisions
United States. Bureau of Employment Security. "Covered Employment by Industrial Divisions," in United States. Bureau of Employment Security. "Employment Security Memorandum, No. 6," Employment and Pay Rolls in State Unemployment Compensation Systems, 1938 (1938) : 40-82. https://fraser.stlouisfed.org/title/193/item/5442/content/pdf/emppay_esm_194040v1/toc/122077 , accessed on April 25, 2024.