Clark, Lindley D. (Lindley Daniel), 1862-1951 and United States. Bureau of Labor Statistics. Minimum-wage Laws of the United States: Construction and Operation : Bulletin of the United States Bureau of Labor Statistics, No. 285 , Washington, D.C: Government Printing Office, July 1921, https://fraser.stlouisfed.org/title/3896, accessed on November 20, 2024.