Ward, Emma F. (Emma France) and United States. Bureau of Labor Statistics. Phosphorus Necrosis in the Manufacture of Fireworks and in the Preparation of Phosphorus : Bulletin of the United States Bureau of Labor Statistics, No. 405 , Washington, D.C: G.P.O., May 1926, https://fraser.stlouisfed.org/title/4028, accessed on December 21, 2024.