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Atlas der Krystallformen (Tafeln) (1913)
Goldschmidt, Victor, 1853-1933 · Heidelberg : Winter · leaf 238
Tafel 230 Band 1 Bournonit Fig. 174. Boussingaultit Fig. 2. Fig. 3.Mineralogy · Crystallography
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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