United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1969," Business Conditions Digest (July 1969) : 83-83. https://fraser.stlouisfed.org/title/43/item/7532/toc/358131 , accessed on May 9, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1969," Business Conditions Digest (July 1969) : 83-83. https://fraser.stlouisfed.org/title/43/item/7532/toc/358131 , accessed on May 9, 2024.