United States. Bureau of Economic Analysis. "Business Capital Expenditures for Air and Water Pollution Abatement, 1973 and Planned 1974, BEA 74-52,"
Bureau of Economic Analysis (BEA) News Releases
(August 19, 1974).
https://fraser.stlouisfed.org/title/6148/item/597177, accessed on March 22, 2025.
@FedFRASER