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Godehard Lenzen
Godehard Lenzen
Books
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Edelsteinbestimmung mit gemmologischen Geräten
318
pages
12
hours of reading
5.0
Track
Diamantenkunde
336
pages
12
hours of reading
4.0
Die Qualitätsmerkmale des Diamanten. Teil I. Die Farbe
Track
4.0
