United States. Bureau of Labor Statistics. "National Survey of Professional, Administrative, Technical, and Clerical Pay, June 1967 : Bulletin of the United States Bureau of Labor Statistics, No. 1585,"
National Survey of Professional, Administrative, Technical, and Clerical Pay
(1968).
https://fraser.stlouisfed.org/title/4570/item/498412, accessed on March 16, 2025.
@FedFRASER