Duchy of Jülich
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Roer (department)
Kempen, Germany
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Hermann Heinrich Gossen
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Düren
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Roer
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Apothecaries' system
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Eschweiler
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Tegelen
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Departments of the First French Empire
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Electorate of Cologne
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Kleve
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Mönchengladbach
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History of Cologne
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Duchy of Guelders
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Congress of Vienna
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Departments of France
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Pound (mass)
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Cologne
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Aachen
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