List of Baltic Germans
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Karl Ernst Claus
Jędrzej Śniadecki
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List of people from Saint Petersburg
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Klaus
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Kazan Federal University
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Group 8 element
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1844 in science
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List of Estonians
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Kazan
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Period 5 element
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List of Russian people
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Ruthenia
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1796
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Tartu
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Ruthenium
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January 22
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Timeline of chemical element discoveries
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Karl Karlovich Klaus
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