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<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>
 
<ref>http://www.iup.edu/archives/coal/mining-history/history-of-coke/</ref>
 
<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>
 
<ref>http://patheoldminer.rootsweb.ancestry.com/coke2.html</ref>
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Modern coking plants recover the gas which, after purification, can be used as a fuel.  
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Modern coking plants recover the volatile components which can be separated into ''coal tar'' and ''coal gas''.
    
==Petroleum coke==
 
==Petroleum coke==
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