Occupational Outlook Handbook, 1978-79 Edition : Part 4 : Bulletin of the United States Bureau of Labor Statistics, No. 1955
United States. Bureau of Labor Statistics. "Occupational Outlook Handbook, 1978-79 Edition : Part 4 : Bulletin of the United States Bureau of Labor Statistics, No. 1955," Occupational Outlook Handbook (1978). https://fraser.stlouisfed.org/title/3964/item/498549/content/pdf/bls_1955_1978_pt4, accessed on April 26, 2024.