United States. Bureau of the Census. "February 1989," Business Conditions Digest (February 1989). https://fraser.stlouisfed.org/title/43/item/7510, accessed on May 10, 2024.
United States. Bureau of the Census. "February 1989," Business Conditions Digest (February 1989). https://fraser.stlouisfed.org/title/43/item/7510, accessed on May 10, 2024.