United States. Bureau of Economic Analysis. "April 1937," Survey of Current Business (April 1937). https://fraser.stlouisfed.org/title/46/item/9332, accessed on April 20, 2024.
United States. Bureau of Economic Analysis. "April 1937," Survey of Current Business (April 1937). https://fraser.stlouisfed.org/title/46/item/9332, accessed on April 20, 2024.