Reference | {Deposit:: SHABAD, T. BASIC INDUSTRIAL RESOURCES OF THE USSR,}{Deposit:: COLUMBIA UNIV. PRESS, NEW YORK, 1969, PP. 249, 262.}{Deposit:: RABCHEVSKY, G.A., THE TUNGSTEN INDUSTRY OF THE USSR,}{Deposit:: USBM, MINERAL ISSUES, NOV. 1988, PP. 34-35.} |