Improvement of mine productivity and overall economy by modern technology / 
edited by G. Almgren, I. Berge, R. Matikainen. 
 - Rotterdam :  A. A. Balkema,  1987 
 - 2 v. ;  25 cm. 
<br/><br/><label>ISBN: </label>9061917018 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mining geology--Congresses.