United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "May 1978," Business Conditions Digest (May 1978) : 1-1. https://fraser.stlouisfed.org/title/43/item/7381/toc/226166 , accessed on March 28, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "May 1978," Business Conditions Digest (May 1978) : 1-1. https://fraser.stlouisfed.org/title/43/item/7381/toc/226166 , accessed on March 28, 2024.