Groningse doopsgezinden » Sources » "Peter Harckes en zijn nakomelingen (tot ca. 1700)" van A. van der Laan; http://groningen.ngv.nl/Afdelingsblad/vragen/vragen1998.html; "Doopsgezinde families in het Oldambt 1520-1811" van S. H. Abels (deel 3)
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