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May 25th, 1931. Dr. Herman Schlundt, University of Missouri, Columbia, Mo. Dear Dr. Schlundt: I am herewith sending you a copy of letter received today from Mr. Ho, of the California Inst. of Technology, together with copy of our reply, which is self explanatory. Thru the clock companies we heard that the final copy of the Department of Public Health's report was out. I have written to Dr. Leake, requesting that he send us a copy of this report, and presume that we shall receive same within the next few days. I was given the address of a concern in Germany the other day, who can supply zinc sulphide froe from any alpha radiation - that is according to the party that gave me the information. You may be interested in the address of this concern, which is as follows: E. de Been A.G. Seelze 6. Hannover, Germany. Sincerely yours, Vice President. HHBarker: RH enclosures