Industrial hygiene aspects of silicosis / Louis W. Spolyar -- Control of industrial dust exposures / Paul D. Halley -- Experiences in the use of aluminum therapy--medical aspects / David R. Johns -- Discussion of medical aspects of aluminum powder treatment for the prevention of silicosis / David L. Perry -- Experiences in the use of aluminum therapy--personnel aspects / W.J. Hebard -- Personnel aspects--discussion / Robert G. Scott -- Prevention and treatment of silicosis in British Columbia / W.D. Robson -- A synopsis of pulmonary changes encountered in employees engaged in the manufacture of alumina abrasives--Shaver's disease / C.G. Shaver -- Industrial exposure to aluminum dust / Francis C. Frary -- Criteria for research in the evaluation of aluminum for the prophylaxis of silicosis in industry / E.W. Brown -- Medical research in industry / Walton Van Winkle -- Further observations on silicosis and aluminum therapy / J.W.G. Hannon, Paul G. Bovard.