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New federal safety rules on silica dust aim to protect miners' lungs

The safety rules being announced and finalized today will hold mines to the same standard for silica dust exposure as other employers. These x-rays show black lung disease. (Elaine McMillion Sheldon for PBS Frontline)
The safety rules being announced and finalized today will hold mines to the same standard for silica dust exposure as other employers. These x-rays show black lung disease. (Elaine McMillion Sheldon for PBS Frontline)

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