United States. Bureau of Labor Statistics. "December 1972," The Employment Situation (January 5, 1973). https://fraser.stlouisfed.org/title/144/item/496991, accessed on February 19, 2019.
Public Domain
United States. Bureau of Labor Statistics. "December 1972," The Employment Situation (January 5, 1973). https://fraser.stlouisfed.org/title/144/item/496991, accessed on February 19, 2019.
Public Domain