United States. Bureau of Labor Statistics. "National Survey of Professional, Administrative, Technical, and Clerical Pay, February-March 1964 : Bulletin of the United States Bureau of Labor Statistics, No. 1422," National Survey of Professional, Administrative, Technical, and Clerical Pay (1964). https://fraser.stlouisfed.org/title/4570/item/497924, accessed on March 7, 2025.
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