United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1988," Business Conditions Digest (June 1988) : 67-67. https://fraser.stlouisfed.org/title/43/item/7502/toc/347177 , accessed on April 19, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1988," Business Conditions Digest (June 1988) : 67-67. https://fraser.stlouisfed.org/title/43/item/7502/toc/347177 , accessed on April 19, 2024.