Occupational Outlook Handbook, 1963-64 Edition : Part 1 : Bulletin of the United States Bureau of Labor Statistics, No. 1375
United States. Bureau of Labor Statistics. "Occupational Outlook Handbook, 1963-64 Edition : Part 1 : Bulletin of the United States Bureau of Labor Statistics, No. 1375," Occupational Outlook Handbook (1963). https://fraser.stlouisfed.org/title/3964/item/497807/content/pdf/bls_1375_1963pt1, accessed on April 15, 2024.