United States. Bureau of Labor Statistics. "December 1969," The Employment Situation (January 9, 1970). https://fraser.stlouisfed.org/title/144/item/496955, accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "December 1969," The Employment Situation (January 9, 1970). https://fraser.stlouisfed.org/title/144/item/496955, accessed on April 19, 2024.