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1. Extent and distribution of respiratory effects.

2. The Prevalence of coal workers' pneumoconiosis in US coal miners.

3. Coal workers' pneumoconiosis : review of papers presented at the New York Academy of Sciences Meeting, September 1971.

4. Serum trypsin inhibitor concentrations in coal miners with respiratory symptoms.

5. Discussion.

6. Pulmonary hemodynamics in symptomatic coal miners.