Family tree Bals-Heijkoop » Sources » De voorouders van Z.K.H. Claus prins der Nederlanden, , door mr W. W. van Valkenburg, in de Nederlandsche Leeuw 1966, Genea
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De voorouders van Z.K.H. Claus prins der Nederlanden, door mr W. W. van Valkenburg, in de Nederlandsche Leeuw 1966, Genea
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