Area Wage Survey: The Pittsburgh, Pennsylvania, Metropolitan Area, January 1969 : Bulletin of the United States Bureau of Labor Statistics, No. 1625-59
United States. Bureau of Labor Statistics. "Area Wage Survey: The Pittsburgh, Pennsylvania, Metropolitan Area, January 1969 : Bulletin of the United States Bureau of Labor Statistics, No. 1625-59," Area Wage Survey (1969). https://fraser.stlouisfed.org/title/4655/item/498504, accessed on May 30, 2024.