United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1988," Business Conditions Digest (March 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7499/toc/346601 , accessed on April 24, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1988," Business Conditions Digest (March 1988) : 1-1. https://fraser.stlouisfed.org/title/43/item/7499/toc/346601 , accessed on April 24, 2024.