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Groen van Prinsterer. His written legacy. Correspondence from 1808-1876 and papers from 1821-1876
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Correspondence of Simon van Slingelandt and Sicco van Goslinga 1697-1731
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Correspondence of Hugo Grotius 1597-1645
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Beatrix and Constantijn. Correspondance between Béatrix de Cusance and Constantijn Huygens 1652 -1662
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Correspondance de Guillaume le Taciturne, prince d’Orange
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