La obra completa del renombrado gramático de la lengua castellana, Francisco Sánchez, más conocido como Sanctius, es una colección de tratados que abordan la gramática de la lengua castellana, así como la historia y evolución de la lengua. Esta obra es fundamental para los estudiantes de filología y lingüística hispánica ya que establece las bases para el estudio riguroso de la lengua castellana. Además, la introducción del erudito Gregorio Mayáns y Siscar, enriquece aún más esta obra de referencia.

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