United States. Bureau of the Census. "Other Key Indicators," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 14-14. https://fraser.stlouisfed.org/title/43/item/7357/toc/116534 , accessed on April 18, 2024.
United States. Bureau of the Census. "Other Key Indicators," in United States. Bureau of the Census. "May 1976," Business Conditions Digest (May 1976) : 14-14. https://fraser.stlouisfed.org/title/43/item/7357/toc/116534 , accessed on April 18, 2024.