United States. Bureau of Economic Analysis. "June 1927," Survey of Current Business (June 1927). https://fraser.stlouisfed.org/title/46/item/9214, accessed on December 3, 2023.
United States. Bureau of Economic Analysis. "June 1927," Survey of Current Business (June 1927). https://fraser.stlouisfed.org/title/46/item/9214, accessed on December 3, 2023.