Beck, Richard .
Nature of ore deposits / by Richard Beck. - New Delhi : SBW publishers , 1994 - 2 vols :
81-857048-05-3
Mining
H / N4.2
Nature of ore deposits / by Richard Beck. - New Delhi : SBW publishers , 1994 - 2 vols :
81-857048-05-3
Mining
H / N4.2