United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "July 1987," Business Conditions Digest (July 1987) : 2-2. https://fraser.stlouisfed.org/title/43/item/7491/toc/293368 , accessed on March 18, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "July 1987," Business Conditions Digest (July 1987) : 2-2. https://fraser.stlouisfed.org/title/43/item/7491/toc/293368 , accessed on March 18, 2024.