United States. Bureau of Labor Statistics. Discussions of Industrial Accidents and Diseases: At the 1933 Meeting of the International Association of Industrial Accident Boards and Commissions, Chicago, Ill : Bulletin of the United States Bureau of Labor Statistics, No. 602 , Washington: United States Government Printing Office, May 1934, https://fraser.stlouisfed.org/title/4120, accessed on December 26, 2024.