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) : 36-36. https://fraser.stlouisfed.org/title/43/item/7172/toc/299582 , accessed on April 23, 2024.