| http://www.w3.org/ns/prov#value | - In a notice scheduled to be published May 1 in the Federal Register, MSHA said chronic coal-dust exposure causes lung diseases such as coal workers???????? pneumoconiosis, emphysema, silicosis and chronic bronchitis, together known as black lung. ???????These diseases are debilitating and can result in disability and premature death,??????? the safety group said.
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