United States. Bureau of Economic Analysis. "May 1929," Survey of Current Business (May 1929). https://fraser.stlouisfed.org/title/46/item/9237, accessed on December 6, 2023.
United States. Bureau of Economic Analysis. "May 1929," Survey of Current Business (May 1929). https://fraser.stlouisfed.org/title/46/item/9237, accessed on December 6, 2023.