United States. Bureau of the Census. "Diffusion Indexes," in United States. Bureau of the Census. "June 1982," Business Conditions Digest (June 1982) : 80-83. https://fraser.stlouisfed.org/title/43/item/7430/toc/56333 , accessed on April 25, 2024.
United States. Bureau of the Census. "Diffusion Indexes," in United States. Bureau of the Census. "June 1982," Business Conditions Digest (June 1982) : 80-83. https://fraser.stlouisfed.org/title/43/item/7430/toc/56333 , accessed on April 25, 2024.