United States. Bureau of Labor Statistics. "April 1970," The Employment Situation (May 8, 1970). https://fraser.stlouisfed.org/title/144/item/496959, accessed on April 16, 2024.
United States. Bureau of Labor Statistics. "April 1970," The Employment Situation (May 8, 1970). https://fraser.stlouisfed.org/title/144/item/496959, accessed on April 16, 2024.