United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1964," Business Conditions Digest (April 1964) : 7-8. https://fraser.stlouisfed.org/title/43/item/7202/toc/292446 , accessed on March 28, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "April 1964," Business Conditions Digest (April 1964) : 7-8. https://fraser.stlouisfed.org/title/43/item/7202/toc/292446 , accessed on March 28, 2024.