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June 8,1931. Dr. Frederick B. Flinn. Columbia University, 632 W. 168th St., N.Y.C. Dear Dr. Flinn: I am herewith returning to you the letter from Mr. Ingraham, dated June 5th. We received in this morning's mail a copy of this letter from the Ingrahem Company. I am also enclosing the copy of your letter of June 4th, to Mr. Ingraham. Very truly yours, Vice President. HHBarker:RH enclosures