United States. Bureau of the Census. "Leading Indicators," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 58-59. https://fraser.stlouisfed.org/title/43/item/7241/toc/221740 , accessed on April 25, 2024.
United States. Bureau of the Census. "Leading Indicators," in United States. Bureau of the Census. "July 1967," Business Conditions Digest (July 1967) : 58-59. https://fraser.stlouisfed.org/title/43/item/7241/toc/221740 , accessed on April 25, 2024.