United States. Bureau of Economic Analysis. "1974 Business Capital Expenditures for Air and Water Pollution Abatement Fell Short of Expectations, BEA 75-33,"
Bureau of Economic Analysis (BEA) News Releases
(May 13, 1975).
https://fraser.stlouisfed.org/title/6148/item/595452, accessed on March 20, 2025.
@FedFRASER