United States. Bureau of the Census. "Diffusion Indexes," in United States. Bureau of the Census. "March 1984," Business Conditions Digest (March 1984) : 80-83. https://fraser.stlouisfed.org/title/43/item/7451/toc/168996 , accessed on May 5, 2024.
United States. Bureau of the Census. "Diffusion Indexes," in United States. Bureau of the Census. "March 1984," Business Conditions Digest (March 1984) : 80-83. https://fraser.stlouisfed.org/title/43/item/7451/toc/168996 , accessed on May 5, 2024.