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Cohmbia Unimersity Onllege of and Singeons EPIDEMIOLOGY 632 WEST 168m STREET, NEW YORK INDUSTRIAL HYGIENE PUBLIC HEALTH ADMINISTRATION INSTITUTE OF PUBLIC HEALTH SANITARY SCIENCE Janl3, 1935. Mr.H. H. Barker, United States Radium Corporation, New York, N. Y. Dear Mr. Barker: As you requested I am enclosing my bill in connection with the recent law case. I am basing my charges at the rates which Dr. Schlundt, you and I discussed some years ago. Also at the rate which I have charged in other cases. If it is not satisfactory let me know. Yourg India truly h B. Thum Frederick B. Flinn Fate JAN 15.10.25