United States. Bureau of Economic Analysis. "April 1999," Survey of Current Business (April 1999). https://fraser.stlouisfed.org/title/46/item/9949, accessed on May 6, 2024.
United States. Bureau of Economic Analysis. "April 1999," Survey of Current Business (April 1999). https://fraser.stlouisfed.org/title/46/item/9949, accessed on May 6, 2024.