North American Industry Classification System (NAICS) 2002
- 21 - Mining and Oil and Gas Extraction
- 212 - Mining (except Oil and Gas)
- 2121 - Coal Mining
- 21211 - Coal Mining
- 212114 - Bituminous Coal MiningCAN
- 212115 - Subbituminous Coal MiningCAN
- 212116 - Lignite Coal MiningCAN
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