| Reference | {Deposit:: SHABAD, THEODORE, BASIC INDUSTRIAL RESOURCES OF THE U.S.S.R.}{Deposit:: COLUMBIA UNIVERSITY PRESS, NEW YORK & LONDON, 1969, PP.}{Deposit:: 249-267.}{Deposit:: ROSKILL INFORMATION SERVICES LTD, THE ECONOMICS OF TIN,}{Deposit:: SIXTH EDITION, 1990, PP. 232-233.} |