United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1969," Business Conditions Digest (June 1969) : 3-4. https://fraser.stlouisfed.org/title/43/item/7531/toc/242215 , accessed on May 9, 2024.
United States. Bureau of the Census. "Table of Contents," in United States. Bureau of the Census. "June 1969," Business Conditions Digest (June 1969) : 3-4. https://fraser.stlouisfed.org/title/43/item/7531/toc/242215 , accessed on May 9, 2024.