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- Deposit:: ATLAS OF EASTERN EUROPE, CENTRAL INTELLIGENCE AGENCY,
- Deposit:: AUGUST 1990.
- Deposit:: METALLGESELLSCHAFT AG, DEVELOPMENT TRENDS OF THE
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- Deposit:: DECEMBER 1991.
- Deposit:: COMMODITIES RESEARCH UNIT LIMITED, THE BASE METAL
- Deposit:: INDUSTRIES OF EASTERN EUROPE, NOV. 1990.
- Geology:: HURLBUT, CORNELIUS S., DAN* MANUAL OF MINERALOGY,
- Geology:: EIGHTEENTH EDITION, 1971.
- Production:: MINERAL FACTS AND PROBLEMS, UNITED STATES DEPARTMENT OF
- Production:: THE INTERIOR, BUREAU OF MINES BULLETIN 675, EDITION 1985.
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