Area Wage Survey: The Portland, Maine, Metropolitan Area, November 1971 : Bulletin of the United States Bureau of Labor Statistics, No. 1725-22
United States. Bureau of Labor Statistics. "Area Wage Survey: The Portland, Maine, Metropolitan Area, November 1971 : Bulletin of the United States Bureau of Labor Statistics, No. 1725-22," Area Wage Survey (1972). https://fraser.stlouisfed.org/title/4655/item/498800, accessed on May 1, 2024.