Boutlow, W.S <br/><br/>
Practical coal mining 
Boutlow, W.S 
 - London  Gresham  1911 
 - 176 pagesVol,5 
<br/><br/><br/>In English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining
<br/><br/><label>Dewey Class. No.: </label>Obvci 18 1911