Thimons, H.U. Friadrich <br/><br/>
Coal: Current Advances in Mining Techniques 

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 - New York  M.S.S.  1976 
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<br/><br/>  Coal 
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<br/><br/><label>Subjects--Index Terms: </label>Coal: Current Advances in Mining Techniques 
<br/><br/><label>Dewey Class. No.: </label>622. 33