NBER Roughly Coincident Indicators
United States. Bureau of the Census. "NBER Roughly Coincident Indicators," in United States. Bureau of the Census. "October 1961," Business Conditions Digest (October 1961) : 14-16. https://fraser.stlouisfed.org/title/43/item/7172/toc/299570 , accessed on May 5, 2024.