United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1987," Business Conditions Digest (February 1987) : 1-1. https://fraser.stlouisfed.org/title/43/item/7486/toc/252972 , accessed on April 19, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1987," Business Conditions Digest (February 1987) : 1-1. https://fraser.stlouisfed.org/title/43/item/7486/toc/252972 , accessed on April 19, 2024.