mention the types which is classified as high grade varaity
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There are four major types (or “ranks”) of coal.
...
The four ranks are:
Anthracite: The highest rank of coal. ...
Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. ...
Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.
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