| Reference | {Deposit:: RABCHEVSKY, GEORGE, A., MINERAL ISSUES: AN ANALYTICAL SERIES}{Deposit:: THE TUNGSTEN INDUSTRY OF THE U.S.S.R., USDOI, BUREAU OF}{Deposit:: MINES, NOVEMBER 1988, P. 26.}{Deposit:: SHABAD, THEODORE, BASIC INDUSTRIAL RESOURCES OF THE U.S.S.R.}{Deposit:: COLUMBIA UNIVERSITY PRESS, NEW YORK & LONDON, 1969, P. 147} |