United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "March 1975," Business Conditions Digest (March 1975) : 2-2. https://fraser.stlouisfed.org/title/43/item/7343/toc/63795 , accessed on May 7, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "March 1975," Business Conditions Digest (March 1975) : 2-2. https://fraser.stlouisfed.org/title/43/item/7343/toc/63795 , accessed on May 7, 2024.