Hoffman, Frederick L. (Frederick Ludwig), 1865-1946 and United States. Bureau of Labor Statistics. Deaths From Lead Poisoning, 1925-1927 : Bulletin of the United States Bureau of Labor Statistics, No. 488 , Washington, D.C: G.P.O., June 1929, https://fraser.stlouisfed.org/title/4063, accessed on August 6, 2024.