Groningse doopsgezinden » Sources » "Familierelaties tussen Lambert Jacobsz, Jacob Backer en de familie De Heer" (Piet Bakker); "Oud Holland", Volumes 43-44, Netherlands Institute for Art History, 1976; Wikipedia
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"Familierelaties tussen Lambert Jacobsz, Jacob Backer en de familie De Heer" (Piet Bakker); "Oud Holland", Volumes 43-44, Netherlands Institute for Art History, 1976; Wikipedia
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