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February 10,1931. Dr. Henry C. Johnston, 79 John St., New York City. Dear Dr. Johnston: Thanks for your letter of February 9th, enclosing receipted bills, as well as clipping relative to *Parathyroid in Radium Poisoning". We are quite familiar with the work which Dr. Flinn has been doing in this direction. Sincerely yours, Vice President. HHBarker: RH