Tribology in mines 
/ Seminar Proceedings Calcutta, February 2-3, 1978 
 - New Delhi:   National Productivity Council,   1979 
 - xv, 269p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Universal Decimal Class. No.: </label>620.1:622  / L9