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March 19, 1924. Dr. C. T. Grahan-Rogers, Medical Inspector, State of New York Department of Labor, 124 East 28th St., Nex York City. My dear Dr. Graham-Rogers:- Then you were here a few days ago to inquire whether any phosphorus was used in our Application Plant, you mentioned a number of causes for jaw bone necrosis other than phosphorus poisoning. Will you be good enough to send me a list of them ? Yours truly, President. ARoeder-HM