United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 1-1. https://fraser.stlouisfed.org/title/43/item/7227/toc/383997 , accessed on April 26, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "May 1966," Business Conditions Digest (May 1966) : 1-1. https://fraser.stlouisfed.org/title/43/item/7227/toc/383997 , accessed on April 26, 2024.