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ECONOMIC ISSUES IN MINERAL RESOURCE ADEQUACY AND IN THE LONG-TERM SUPPLY OF MINERALS = QUESTIONS ECONOMIQUES RELATIVES A LA SATISFACTION DES BESOINS MINIERS ET A LA FOURNITURE A LONG TERME DE PRODUITS MINIERSZWARTENDYK JAN.1981; ECON. GEOL. BULL. SOC. ECON. GEOL.; ISSN 0361-0128; USA; DA. 1981-08; VOL. 76; NO 5; PP. 999-1005; BIBL. 8 REF.; ILL.Article
