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Because of the great importance the pneumoconiosis and especially the silicosis problem have assumed within the past few years, the Trudeau School of Tuberculosis devoted one week of the regular 1934 course exclusively to silicosis and tuberculosis. The symposium was under the direction of L. U. Gardner. The etiology of silicosis was presented by R. R. Jones of the U. S. Public Health Service, who emphasized that crystalline silica was the essential causative factor. D. E. Cummings of the Saranac Laboratories described dust measurements, emphasized the importance of routine medical examinations, and stated that demonstrable silicosis generally occurred after more than five years' exposure to concentrations of pure silica in excess of 5,000,000 particles per cubic foot. The third paper, by Gardner, is much the most complete and perhaps the most important of the series. His own work is tersely reviewed, and much interesting and informative data are added on
Symposium on Silicosis. JAMA. 1935;104(16):1449. doi:10.1001/jama.1935.02760160073037