United States. Bureau of Economic Analysis. "February 1972," Survey of Current Business (February 1972). https://fraser.stlouisfed.org/title/46/item/9815, accessed on April 20, 2024.
United States. Bureau of Economic Analysis. "February 1972," Survey of Current Business (February 1972). https://fraser.stlouisfed.org/title/46/item/9815, accessed on April 20, 2024.