United States. Bureau of Economic Analysis. "1975 Capital Expenditures for Pollution Abatement Up 17 Percent, BEA 76-34,"
Bureau of Economic Analysis (BEA) News Releases
(May 18, 1976).
https://fraser.stlouisfed.org/title/6148/item/595555, accessed on March 22, 2025.
@FedFRASER