United States. Bureau of Economic Analysis. "May 1972 Part I," Survey of Current Business (May 1972 Part I). https://fraser.stlouisfed.org/title/46/item/9819, accessed on April 25, 2024.
United States. Bureau of Economic Analysis. "May 1972 Part I," Survey of Current Business (May 1972 Part I). https://fraser.stlouisfed.org/title/46/item/9819, accessed on April 25, 2024.