Area Wage Survey: Portland, Maine, Metropolitan Area, November 1973 : Bulletin of the United States Bureau of Labor Statistics, No. 1795-6
United States. Bureau of Labor Statistics. "Area Wage Survey: Portland, Maine, Metropolitan Area, November 1973 : Bulletin of the United States Bureau of Labor Statistics, No. 1795-6," Area Wage Survey (1974). https://fraser.stlouisfed.org/title/4655/item/499016, accessed on April 25, 2024.