Perhaps you should try some spelling variations:
"acta salmanticensia. estudios historico de graficos ;" » "acta salmanticensia. estudios historicos de graficos ;", "acta salmanticensia. estudio historico de graficos ;", "acta salmanticensia. espacios historicos de graficos ;"
"acta salmanticensia. estudios historico de geografia ;" » "acta salmanticensia. estudios historicos de geografia ;", "acta salmanticensia. estudio historico de geografia ;", "acta salmanticensia. espacios historicos de geografia ;", "acta salmanticensia. estudios historico la geografia ;"

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