United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7347/toc/239352 , accessed on April 18, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "July 1975," Business Conditions Digest (July 1975) : 1-1. https://fraser.stlouisfed.org/title/43/item/7347/toc/239352 , accessed on April 18, 2024.