United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1961," Business Conditions Digest (December 1961) : 2-2. https://fraser.stlouisfed.org/title/43/item/7174/toc/311279 , accessed on May 5, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1961," Business Conditions Digest (December 1961) : 2-2. https://fraser.stlouisfed.org/title/43/item/7174/toc/311279 , accessed on May 5, 2024.