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"It has a carbon content of between 77 and 87% on a dry ash-free basis and a heating value that is much higher than lignite or sub bituminous coal.<a href='https://trike-attac.com/qa/what-is-ranking-of-coal.html#qa-which-coal-has-highest-ash-content'>figure out</a>"
<https://trike-attac.com/qa/what-is-ranking-of-coal.html>