United States. Bureau of Economic Analysis. "September 1967," Survey of Current Business (September 1967). https://fraser.stlouisfed.org/title/46/item/9745, accessed on April 18, 2024.
United States. Bureau of Economic Analysis. "September 1967," Survey of Current Business (September 1967). https://fraser.stlouisfed.org/title/46/item/9745, accessed on April 18, 2024.