Index of Stock Prices, 500 Common Stocks
United States. Bureau of the Census. "Index of Stock Prices, 500 Common Stocks," in United States. Bureau of the Census. "October 1961," Business Conditions Digest (October 1961) : 44-44. https://fraser.stlouisfed.org/title/43/item/7172/toc/299588 , accessed on April 25, 2024.