National Bureau of Casualty and Surety Underwriters (U.S.) , American Standards Association , American Engineering Standards Committee and United States. Bureau of Labor Statistics. Safety Code for Mechanical Power-Transmission Apparatus : Bulletin of the United States Bureau of Labor Statistics, No. 364 , Washington, D.C: G.P.O., August 1924, https://fraser.stlouisfed.org/title/4001, accessed on September 11, 2024.