United States. Bureau of Labor Statistics. "Industry Wage Survey: Laundry and Cleaning Services, April 1967 and April 1968 : Bulletin of the United States Bureau of Labor Statistics, No. 1645," Industry Wage Survey: Laundries and Cleaning Services (1969). https://fraser.stlouisfed.org/title/4606/item/498546, accessed on September 11, 2024.