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Atlas der Krystallformen (Tafeln) (1913)
Goldschmidt, Victor, 1853-1933 · Heidelberg : Winter · leaf 29
Tafel 21 Band 1 Amphibol (Monoklin) Pargasit Fig. 176. Riebeckit Fig. 179. Fig. 180. Fig. 181.Mineralogy · Crystallography
Internet Archive · Fisher - University of Toronto · Public domain (published before 1931). Free to use for anything.
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