Groningse doopsgezinden » Sources » "Ik heb het groote doel mijner Aardsche bestemming bereikt" van S. P. Martens en S. Vuyk; Sibrand Martens; http://www.martens-harten.eu/Sibrand-Pieter-Brouwer-Martens/gezin-woudbeek-heerens-1.htm; Jan Pieter de Groot; Familie-aantekeningen van Elsje Clazes Woudbeek
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