Family tree De Beer/Friesland » Sources » http://www.allefriezen.nl/nl/component/genealogie/?task=persoon_result&zoekmethode=eenvoudig&persoon_1_achternaam=Gonggrijp&persoon_1_tussenvoegsel=&persoon_1_voornaam=Hendrik&persoon_1_patroniem=Joosten
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