United States. Bureau of Economic Analysis. "April 1929," Survey of Current Business (April 1929). https://fraser.stlouisfed.org/title/46/item/9236, accessed on May 1, 2024.
United States. Bureau of Economic Analysis. "April 1929," Survey of Current Business (April 1929). https://fraser.stlouisfed.org/title/46/item/9236, accessed on May 1, 2024.