United States. Bureau of Economic Analysis. "September 1926," Survey of Current Business (September 1926). https://fraser.stlouisfed.org/title/46/item/9206, accessed on December 10, 2023.
United States. Bureau of Economic Analysis. "September 1926," Survey of Current Business (September 1926). https://fraser.stlouisfed.org/title/46/item/9206, accessed on December 10, 2023.