United States. Bureau of Economic Analysis. "Antipollution Spending Increased 12 Percent in 1976--Down from 18 Percent in 1975, BEA 78-8," Bureau of Economic Analysis (BEA) News Releases (February 14, 1978). https://fraser.stlouisfed.org/title/6148/item/595722, accessed on March 22, 2025.
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