United States. Bureau of Labor Statistics. "Area Wage Survey: The Muskegon-Muskegon Heights, Michigan, Metropolitan Area, June 1970 : Bulletin of the United States Bureau of Labor Statistics, No. 1660-85,"
Area Wage Survey
(1970).
https://fraser.stlouisfed.org/title/4655/item/498638, accessed on July 9, 2025.