United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "April 1964," Business Conditions Digest (April 1964) : 2-2. https://fraser.stlouisfed.org/title/43/item/7202/toc/292444 , accessed on May 9, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "April 1964," Business Conditions Digest (April 1964) : 2-2. https://fraser.stlouisfed.org/title/43/item/7202/toc/292444 , accessed on May 9, 2024.