United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "March 1988," Business Conditions Digest (March 1988) : 66-66. https://fraser.stlouisfed.org/title/43/item/7499/toc/346636 , accessed on June 25, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "March 1988," Business Conditions Digest (March 1988) : 66-66. https://fraser.stlouisfed.org/title/43/item/7499/toc/346636 , accessed on June 25, 2024.