United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "July 1971," Business Conditions Digest (July 1971) : 70-70. https://fraser.stlouisfed.org/title/43/item/7556/toc/149243 , accessed on April 19, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "July 1971," Business Conditions Digest (July 1971) : 70-70. https://fraser.stlouisfed.org/title/43/item/7556/toc/149243 , accessed on April 19, 2024.