United States. Bureau of Economic Analysis. "U.S. Plant and Equipment Expenditures by Business : Business Plant and Equipment Programs for 1971, OBE 71-56|SEC 2541,"
Bureau of Economic Analysis (BEA) News Releases
(September 3, 1971).
https://fraser.stlouisfed.org/title/6148/item/595255, accessed on March 22, 2025.
@FedFRASER