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Geologicoespaa. es Primer mapa geolgico de Espaa publicado por Joaqun Ezquerra del Bayo en Frochoso Snchez Sierra lvarez La construccin de los mapas geolgicos espaoles del siglo XIX Observacin conceptuacin representacin Era Universidad de Oviedo pp ISSN Joaqun Ezquerra del Bayo PDArt PDoldauto Uploaded with Geological maps