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ES1253A1880-11-191880-11-19Mejoras en el tratamiento de blendas que contienen galena y otros minerales de zinc, de plomo y de plata.
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Survey of British Commonwealth Affairs. Volume II, Problems of Economic Policy, 1918–1939. Part 2. By WK Hancock, Professor of History in the University of Birmingham; Former Fellow of All Souls College, Oxford.[Royal Institute of International Affairs.](New York: Oxford University Press. 1942. Pp. xii, 355. $5.00.)