United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1976," Business Conditions Digest (April 1976) : 3-4. https://fraser.stlouisfed.org/title/43/item/7356/toc/360141 , accessed on March 28, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1976," Business Conditions Digest (April 1976) : 3-4. https://fraser.stlouisfed.org/title/43/item/7356/toc/360141 , accessed on March 28, 2024.