Kerr G L <br/><br/>
Practical coal mining 
Kerr G L 
 - London  Griffin  1905 
 - 504 pages, 
<br/><br/><br/>In English 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining
<br/><br/><label>Dewey Class. No.: </label>Obvic 5 1905