United States. Bureau of Labor Statistics. "Occupational Wage Survey: Allentown-Bethlehem-Easton, Pennsylvania, May 1952 : Bulletin of the United States Bureau of Labor Statistics, No. 1111,"
Occupational Wage Survey
(1952).
https://fraser.stlouisfed.org/title/4510/item/495127, accessed on February 19, 2025.