United States. Bureau of Economic Analysis. "March 1927," Survey of Current Business (March 1927). https://fraser.stlouisfed.org/title/46/item/9211, accessed on December 6, 2023.
United States. Bureau of Economic Analysis. "March 1927," Survey of Current Business (March 1927). https://fraser.stlouisfed.org/title/46/item/9211, accessed on December 6, 2023.