United States. Bureau of Economic Analysis. "November 1930," Survey of Current Business (November 1930). https://fraser.stlouisfed.org/title/46/item/9255, accessed on April 19, 2024.
United States. Bureau of Economic Analysis. "November 1930," Survey of Current Business (November 1930). https://fraser.stlouisfed.org/title/46/item/9255, accessed on April 19, 2024.