United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1988," Business Conditions Digest (September 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7505/toc/370764 , accessed on April 19, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "September 1988," Business Conditions Digest (September 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7505/toc/370764 , accessed on April 19, 2024.