United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "May 1981," Business Conditions Digest (May 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7417/toc/359039 , accessed on July 15, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "May 1981," Business Conditions Digest (May 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7417/toc/359039 , accessed on July 15, 2024.