Coal exploration :  Proceedings of the second international coal exploration symposium, denver, colorado, u.s.a. october 1978 / 
Edited by George o. argall 
 - 560 páginas 
<br/><br/><label>ISBN: </label>0879301074 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Carbón--Congresos<br/>Prospección--Congresos
<br/><br/><label>LC Class. No.: </label>TN271.C58  / I57 1978