United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1969," Business Conditions Digest (March 1969) : 1-1. https://fraser.stlouisfed.org/title/43/item/7528/toc/62111 , accessed on May 9, 2024.
United States. Bureau of the Census. "Cover Page," in United States. Bureau of the Census. "March 1969," Business Conditions Digest (March 1969) : 1-1. https://fraser.stlouisfed.org/title/43/item/7528/toc/62111 , accessed on May 9, 2024.