United States. Bureau of Economic Analysis. "May 1971," Survey of Current Business (May 1971). https://fraser.stlouisfed.org/title/46/item/9805, accessed on June 29, 2024.
United States. Bureau of Economic Analysis. "May 1971," Survey of Current Business (May 1971). https://fraser.stlouisfed.org/title/46/item/9805, accessed on June 29, 2024.