United States. Bureau of the Census. "Sales of Retail Stores," in United States. Bureau of the Census. "May 1967," Business Conditions Digest (May 1967) : 62-65. https://fraser.stlouisfed.org/title/43/item/7239/toc/401957 , accessed on May 6, 2024.
United States. Bureau of the Census. "Sales of Retail Stores," in United States. Bureau of the Census. "May 1967," Business Conditions Digest (May 1967) : 62-65. https://fraser.stlouisfed.org/title/43/item/7239/toc/401957 , accessed on May 6, 2024.