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C-O N riDENTl A-L Mellon Institute of Industrial Research UNIVERSITY- OF PITTSBURGH PLAINTIFF'S EXHIBIT IHF-326 PROGRESS REPORT for the week ended March 9, 1946 INDUSTRIAL HYGIENE ROUl'TATIOM Subjects under which report is to be indexed Industrial Fellowship No. 259-12 5 copies made: 1 - Mellon Institute 2 - Industrial Hygiene files The summary of the paper on "Appraising Exposures to Silica Dust" was prepared. The material will be presented before A.I.H.A. in April. A number of sand samples were separated for dustiness index tests. ; Major J. Flanagen, Ohio Dept, of Public Health, visited the Fellowship during the afternoon, March 8, 1946. Air sampling, particle size separation and X-ray diffraction analysis were discussed at length. , R: 5/11/46 Tt 5/12/46 R: ________ Francis R. Holden, Ph.D. Senior Fellow