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UNIVERSITY OF MISSOURI COLUMBIA DEPARTMENT OF CHEMISTRY APR 6 1930 April 4, 1930 Dr. . H. H. Barker U. S. Radium Corporation 535 Pearl Street New York City, N.Y. Dear Howard: Some time ago in response to my request you said that you would send a small sample of your high-grade luminous Zinc Sulfide practically free from Radium. This sample has never arrived, and I am just wondering whether it was ever shipped from your laboratory. Yours very sincerely, Herman Schlunatt Herman Schlundt. HS By bm.a. gma 303 is now shining out every might on our herese. to Please Miss corvey my thanks s for her response Its.