Occupational Outlook Handbook, 1980-81 Edition : Part 2 : Bulletin of the United States Bureau of Labor Statistics, No. 2075
United States. Bureau of Labor Statistics. "Occupational Outlook Handbook, 1980-81 Edition : Part 2 : Bulletin of the United States Bureau of Labor Statistics, No. 2075," Occupational Outlook Handbook (1980). https://fraser.stlouisfed.org/title/3964/item/498765/content/pdf/bls_2075_1980_2, accessed on May 28, 2023.