United States. Bureau of Labor Statistics. "December 1970," The Employment Situation (January 8, 1971). https://fraser.stlouisfed.org/title/144/item/496967, accessed on May 8, 2024.
United States. Bureau of Labor Statistics. "December 1970," The Employment Situation (January 8, 1971). https://fraser.stlouisfed.org/title/144/item/496967, accessed on May 8, 2024.