AUSTRIA = AUTRICHE1983; FINANC. TIMES; ISSN 0307-1766; GBR; DA. 1983; NO 29020; PP. 13-16Article

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LATIN AMERICA. MINERAL CORNUCOPIA = AMERIQUE LATINE. CORNE D'ABONDANCE EN SUBSTANCES MINERALES1982; MIN. J. (LOND.); ISSN 0026-5225; GBR; DA. 1982; VOL. 298; NO 7641; PP. 77-79Article

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COUNCIL OF ECONOMICS. AMERICAN INSTITUTE OF MINING, METALLURGICAL AND PETROLEUM ENGINEERS. ANNUAL MEETING. 104. PROCEEDINGS; NEW YORK; 1975.sdNEW YORK AM. INST. MIN. METALL. PET. ENG.,1975, P. 5 A 235Book

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