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Rudolf Gregorius
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Mineral Waxes
Author: Rudolf Gregorius
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Mineral Waxes, Their Preparation And Uses
Author: Rudolf Gregorius
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A. Hartleben's Chemisch-technische Bibliothek: Erdwachs (Zeresin), Paraffin und Montanwachs, deren Darstellung und Verwendung
Author: Rudolf Gregorius
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