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1913. 49. H. Backlund, Sobrc algiiaas rocas uotables provenientes de Olavarria, prov. de Buenos Aires. Boletin 



X: 2, Serie B (Gcologia). Ministerio de Agiicultura, Diiecciun General de Minas, Geologia e Hidrologia. 

 Buenos Aires. 

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