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Carta a Xavier Abril, 6/5/1927
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Carta a Enrique Bustamante y Ballivián, 15/10/1927
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Carta a Samuel Glusberg, 10/1/1928
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Carta a Miguel Ángel Urquieta, 26/9/1928
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Carta a Samuel Glusberg, 7/11/1928
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Carta a Nicanor A. de la Fuente (Nixa), 12/11/1928
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Carta a Samuel Glusberg, 10/3/1929
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Carta a Carlos Chávez Sánchez, 3/5/1929
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Carta a Samuel Glusberg, 20/6/1929
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Carta a Samuel Glusberg, 29/11/1929
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Carta a Néstor S. Martos, 10/3/1930
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Carta a Juan Marinello, 16/3/1930
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Carta a Luis Alberto Sánchez, 26/3/1930