Mennonites from Groningen » Sources » Nieuw Nederlandsch Biografisch Woordenboek; http://resources4.kb.nl/resources401/dpo/5105/pdf/dpo_5105.pdf; https://chg.kncv.nl/geschiedenis/biografieen/e/eyssonius%2C-r.; De kinderen van Pieter Brongersma en Annetjen Torringa (Albert van der Kaap)
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