United States. Bureau of Labor Statistics and International Association of Industrial Accident Boards and Commissions. Standardization of Industrial Accident Statistics: Reports of the Committee on Statistics and Compensation Insurance Cost of the International Association of Industrial Accident Boards and Commission, 1915-1919 : Bulletin of the United States Bureau of Labor Statistics, No. 276 , Washington, D.C: Government Printing Office, December 1920, https://fraser.stlouisfed.org/title/3890, accessed on December 21, 2024.