Mario de la Vega Grajales de la @SCT_mx y José Arturo Blancas (INEGI), inauguraron el XXVIII intercambio #ETAN http://bit.ly/1lCeMKa
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Mario de la Vega Grajales de la @SCT_mx y José Arturo Blancas (INEGI), inauguraron el XXVIII intercambio #ETAN http://bit.ly/1lCeMKa