| Reference | {Deposit:: BARBOSA, F.L.M., 1973, PERFIL ANALITICO DO TUNGSTENIO: DNPM}{Deposit:: NO.24, RIO DE JANEIRO, BRAZIL, 69P.}{Deposit:: LEFOND, S.J., 1973, BRAZILIAN MINING: RELAXED GOVT ATTITUDE}{Deposit:: THE WAY FOR EXPLOITING CRITICAL RESERVES: MIN. ENG. V.25}{Deposit:: PG.31-45.} |