United States. Bureau of the Census. "Appendixes," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 115-126. https://fraser.stlouisfed.org/title/43/item/7347/toc/239348 , accessed on June 29, 2024.
United States. Bureau of the Census. "Appendixes," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 115-126. https://fraser.stlouisfed.org/title/43/item/7347/toc/239348 , accessed on June 29, 2024.