United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "April 1988," Business Conditions Digest (April 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7500/toc/188253 , accessed on June 29, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "April 1988," Business Conditions Digest (April 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7500/toc/188253 , accessed on June 29, 2024.