United States. Bureau of Economic Analysis. "March 1987," Survey of Current Business (March 1987). https://fraser.stlouisfed.org/title/46/item/10071, accessed on April 18, 2024.
United States. Bureau of Economic Analysis. "March 1987," Survey of Current Business (March 1987). https://fraser.stlouisfed.org/title/46/item/10071, accessed on April 18, 2024.