United States. Bureau of Labor Statistics. "Area Wage Survey: The Allentown-Bethlehem-Easton, Pennsylvania-New Jersey, Metropolitan Area, February 1967 : Bulletin of the United States Bureau of Labor Statistics, No. 1530-53," Area Wage Survey (1967). https://fraser.stlouisfed.org/title/4655/item/498249, accessed on March 4, 2025.
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