| Reference | {Deposit:: METALLGESELLSCHAFT AG, DEVELOPMENT TRENDS OF THE}{Deposit:: NON-FERROUS METALS INDUSTRY IN EASTERN EUROPE,}{Deposit:: DECEMBER 1991.}{Deposit:: COMMODITIES RESEARCH UNIT LIMITED, THE BASE METAL}{Deposit:: INDUSTRIES OF EASTERN EUROPE, LONDON, 1991.}{Deposit:: BOMSEL AND VON HIRSCHHAUSEN, THE MINING AND}{Deposit:: METALLURGICAL INDUSTRIES IN EASTERN EUROPE, CERNA,}{Deposit:: JULY 1991.}{Geology:: HURLBUT, CORNELIUS S., DAN* MANUAL OF MINERALOGY,}{Geology:: EIGHTEENTH EDITION, 1971.} |