United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "January 1987," Business Conditions Digest (January 1987) : 1-1. https://fraser.stlouisfed.org/title/43/item/7485/toc/413475 , accessed on April 24, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "January 1987," Business Conditions Digest (January 1987) : 1-1. https://fraser.stlouisfed.org/title/43/item/7485/toc/413475 , accessed on April 24, 2024.