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What does subbituminous mean?

Looking for the meaning or definition of the word subbituminous? Here's what it means.

Adjective
  1. Partly or imperfectly bituminous.
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See Anthracite, Bituminous Coal, Lignite, Subbituminous Coal, Waste Coal, and Coal Synfuel.
Perhaps the hydrothermal activity served as the impetus for the enhancement of coal rank from lignite or subbituminous to high volatile A bituminous.

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