Mennonites from Groningen » Sources » Wikipedia (Gaykingaheerd); "De Ommelander Borgen en Steenhuizen" van Wiebe Jannes Formsma, R. A. Luitjens-Dijkveld Stol, A. Pathuis; "Tussen Hunze en Lauwers" van G. H. Ligterink; "De Ommelander ridderschap" (2003) van Redmer Alma
Source description
Wikipedia (Gaykingaheerd); "De Ommelander Borgen en Steenhuizen" van Wiebe Jannes Formsma, R. A. Luitjens-Dijkveld Stol, A. Pathuis; "Tussen Hunze en Lauwers" van G. H. Ligterink; "De Ommelander ridderschap" (2003) van Redmer Alma
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