United States. Bureau of Labor Statistics. "Area Wage Survey: The Allentown-Bethlehem-Easton, Pennsylvania-New Jersey, Metropolitan Area, June 1968 : Bulletin of the United States Bureau of Labor Statistics, No. 1575-86," Area Wage Survey (1968). https://fraser.stlouisfed.org/title/4655/item/498398, accessed on March 4, 2025.
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