United States. Bureau of Economic Analysis. "June 1940," Survey of Current Business (June 1940). https://fraser.stlouisfed.org/title/46/item/9371, accessed on May 7, 2024.
United States. Bureau of Economic Analysis. "June 1940," Survey of Current Business (June 1940). https://fraser.stlouisfed.org/title/46/item/9371, accessed on May 7, 2024.