United States. Bureau of the Census. "Leading Indicators," in United States. Bureau of the Census. "May 1970," Business Conditions Digest (May 1970) : 65-65. https://fraser.stlouisfed.org/title/43/item/7542/toc/272014 , accessed on May 11, 2024.
United States. Bureau of the Census. "Leading Indicators," in United States. Bureau of the Census. "May 1970," Business Conditions Digest (May 1970) : 65-65. https://fraser.stlouisfed.org/title/43/item/7542/toc/272014 , accessed on May 11, 2024.