Business Cycle Reference Dates and Duration of Expansions and Contractions in the United States: 1854-1961
United States. Bureau of the Census. "Business Cycle Reference Dates and Duration of Expansions and Contractions in the United States: 1854-1961," in United States. Bureau of the Census. "December 1964," Business Conditions Digest (December 1964) : 67-67. https://fraser.stlouisfed.org/title/43/item/7210/toc/375328 , accessed on March 28, 2024.