Items where Author is "Zelaya, Roberto Antonio"
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Thesis
Deleón Gómez, Dinora del Carmen and Hernández Bonilla, Ligia Astrid and López Del Cid, Miguel Angel and Zelaya, Roberto Antonio (2009) Software interactivo para la educación medioambiental de la población salvadoreña SIEMPOSAL. Bachelor thesis, Universidad de El Salvador.