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What I did is merged the 30 layers of the map (Isabela Map Province - Philippines) and below is what happened.
How do i remove the inside map of the border?
I'm new to QGIS and I'm using QGIS 2.4 Chugiak.
You need to use Vector->GeoprocessingTools->Dissolve and dissolve by an attribute (Dissolve Field) to merge subdivided polygons.
Required, but never shown