United States. Bureau of the Census. "Method of Presentation," in United States. Bureau of the Census. "July 1988," Business Conditions Digest (July 1988) : 9-13. https://fraser.stlouisfed.org/title/43/item/7503/toc/420482 , accessed on May 3, 2024.
United States. Bureau of the Census. "Method of Presentation," in United States. Bureau of the Census. "July 1988," Business Conditions Digest (July 1988) : 9-13. https://fraser.stlouisfed.org/title/43/item/7503/toc/420482 , accessed on May 3, 2024.