Mennonites from Groningen » Sources » "Doopsgezinde families in het Oldambt 1520-1811" van S. H. Abels (deel 1 en 3); https://nl.wikipedia.org/wiki/De_Heemen_(Delfzijl); Parenteel van Asmus Allens; Akte van nalatenschap 16-1-1672; Spanheim
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