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Source contains "Zeitschrift fur Mineral, Juin, p. 533"
ArticlesIssue: 065, 21/01/29 p. 46, Section: Popular Science
Heading: Non-Animated Nature. (Mineralogy), Para 4
Category: Mineralogy Geology Gold
Topic: Washing of Gold. [The practice of washing gold on the Rhine only ceased in 1824]
Source: Zeitschrift fur Mineral, Juin, p. 533
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