United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "June 1981," Business Conditions Digest (June 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7418/toc/412393 , accessed on July 15, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "June 1981," Business Conditions Digest (June 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7418/toc/412393 , accessed on July 15, 2024.