United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "May 1988," Business Conditions Digest (May 1988) : 3-4. https://fraser.stlouisfed.org/title/43/item/7501/toc/40608 , accessed on March 28, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "May 1988," Business Conditions Digest (May 1988) : 3-4. https://fraser.stlouisfed.org/title/43/item/7501/toc/40608 , accessed on March 28, 2024.