United States. Bureau of Economic Analysis. "February 1940," Survey of Current Business (February 1940). https://fraser.stlouisfed.org/title/46/item/9367, accessed on April 18, 2024.
United States. Bureau of Economic Analysis. "February 1940," Survey of Current Business (February 1940). https://fraser.stlouisfed.org/title/46/item/9367, accessed on April 18, 2024.