United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1978," Business Conditions Digest (April 1978) : 3-4. https://fraser.stlouisfed.org/title/43/item/7380/toc/204504 , accessed on April 27, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1978," Business Conditions Digest (April 1978) : 3-4. https://fraser.stlouisfed.org/title/43/item/7380/toc/204504 , accessed on April 27, 2024.