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. Neues Jahrbuch für Mineralogie, Geologie and Paläontologie . R. Brauns, Aetzfiguren auf Sapphir von Ceylon. N. Jahrbuch f. Mineralogie etc. 1906. Bd. I. Taf. V.
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Keywords: ., bookcentury1800, bookidneuesjah, booksubjectgeology, bookyear1830