| Reference | {Deposit:: SHABAD, T., BASIC INDUSTRIAL RESOURCES OF THE USSR,}{Deposit:: COLUMBIA UNIV. PRESS, NEW YORK, 1969, PP. 249, 267.}{Deposit:: RABCHEVSKY, G.A., THE TUNGSTEN INDUSTRY OF THE USSR,}{Deposit:: USBM, MINERAL ISSUES, NOV. 1988, P.45.} |