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Atlas der Krystallformen (Tafeln) (1913)
Goldschmidt, Victor, 1853-1933 · Heidelberg : Winter · leaf 120
Tafel 112 Band 9 Zirkon Fig. 140. Fig. 142. Fig. 143.Mineralogy · Crystallography
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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