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Coal Mining Health Problems
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Silicon

Silicosis

Subtopics:
webJim MorrisCenter for Public Integrity2015-06-29
webNancy LofholmDenver Post2014-11-12
webDaniel CresseyNature2014-03-04
webSteven GreenhouseNew York Times2013-08-23
webWikipedia2012-12-01