United States. Bureau of Economic Analysis. "National Antipollution Spending Increased 18 Percent in 1974, 21 Percent in 1973, BEA 77-06," Bureau of Economic Analysis (BEA) News Releases (January 24, 1977). https://fraser.stlouisfed.org/title/6148/item/595618, accessed on March 22, 2025.
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