Coal mining is a tough job — miners work long hours in harsh conditions, but it pays well and some people love it. Here's what it's like down below.
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A Brief History of Mining - EARTH SYSTEMS
Documenting 'Dirty' Jobs: Miners At Work : The Picture Show : NPR
CDC - Mining - History of the Mining Program - NIOSH
What Life Is Like Working in Underground Coal Mines in the US
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What Life Is Like Working in Underground Coal Mines in the US
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What Life Is Like Working in Underground Coal Mines in the US
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What Life Is Like Working in Underground Coal Mines in the US
What's it like working in a coal mine? - Quora