United States. Bureau of Economic Analysis. "September 1969," Survey of Current Business (September 1969). https://fraser.stlouisfed.org/title/46/item/9785, accessed on May 9, 2024.
United States. Bureau of Economic Analysis. "September 1969," Survey of Current Business (September 1969). https://fraser.stlouisfed.org/title/46/item/9785, accessed on May 9, 2024.