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April 13th, 1931. Dr. s. C. Lind, University of Minnesota, School of Chemistry, Minneapolis, Minn. Dear Dr. Ling: I am herewith sending you a copy of a letter which I have today written to Dr. Berrisford. I trust that the information I have given is along the line which Dr. Berrisford desires. We wish to thank you for calling this inquiry to our attention. Sincerely yours, Vice President. HHBarker:Ri