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references : 1) Osvaldo R. Arce Burgoa (2007) Guia a los Yacimientos Metaliferos de Bolivia. (Minera San Cristobal S.A. & Empresa Minera Unificada S.A., La Paz) 2) Mining Annual Review(1985):338. - Werner, A.B.T., Sinclair, W.D., and Amey, E.B. (1998): International Strategic Mineral Issues Summary Report - Tungsten. US Geological Survey Circular 930-O. |
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18/12/09
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