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July 28,1919 Mr.Roeder In regard to your lotter of July 23rd,re- ferring to letter from Dr.Harold W.Dana to Dr. Willis, I have sent him a preliminary letter, and will forward him details tomorrow on emanation water sum theropie. I hope to make him enthusiastic enough to buy 10 milligrams of Radium instead of 1/10 as he now desires. Yours very truly EXTRACTION PLANT DR. S:AWM BY M Robock 11.20.1919 c LUMINOUS CORP.