Pt Koba Tin Bangka Island

MINING ANNUAL REVIEW LONDON, 1970-1982.WORLD MINING, JANUARY, 1977, PP 50.MINING INTERNATIONAL YEAR BOOK, FINANCIAL TIMES, LONDON,ENGLAND, 1981.INTERNATIONAL TIN COUNCIL LISTING, 1982.BUKU STATISTIK, P.T. TAMBANG TIMAH (PERSERO), 1980.AUSTRALIAN MINERAL ECONOMICS PTY., THE WORLD TIN INDUSTRYSUPPLY AND DEMAND, SEPTEMBER, 1980.INTERNATIONAL TIN COUNCIL, TIN PRODUCTION AND DEVELOPMENT1979.INTERNATIONAL TIN COUNCIL, REPORTS OCTOBER 1982, 1979.U.S. DEPARTMENT OF COMMERCE, MINERALS YEARBOOK, 1978-79,PP 928.HARYANTO, R., DEVELOPMENT OF TIN ORE TREATMENT AT P.T. KOBATIN, SEMINAR ON BENEFICIATION OF TIN AND ASSOCIATEDMINERALS, SEATRAD CENTRE, IPOH, MALAYSIA.INTERNATIONAL TIN COUNCIL, COMMITTEE ON DEVELOPMENT, REPORTNO. 26-10, JUNE, 1977, 2 P.SOUTH-EAST ASIA MINING LETTER-SAML, P. 6 (JAN. 14, 1994).