United States. Bureau of Economic Analysis. "Pollution Abatement and Control Expenditures in Constant (1972) Dollars Incresed 2 Percent in 1977, BEA 79-15,"
Bureau of Economic Analysis (BEA) News Releases
(March 2, 1979).
https://fraser.stlouisfed.org/title/6148/item/595829, accessed on March 22, 2025.
@FedFRASER