| Reference | {Commodity:: INTERFAX, MINING REPORT, P. 8 (JUNE 18-25, 1993).}{Deposit:: RABCHEVSKY, GEORGE A., THE TUNGSTEN INDUSTRY OF THE U.S.S.R.}{Deposit:: MINERAL ISSUES: AN ANALYTICAL SERIES, USDOI, BUREAU OF}{Deposit:: MINES, NOVEMBER 1988, P. 33.} |