United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1967," Business Conditions Digest (February 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7236/toc/169869 , accessed on April 19, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "February 1967," Business Conditions Digest (February 1967) : 1-1. https://fraser.stlouisfed.org/title/43/item/7236/toc/169869 , accessed on April 19, 2024.