Family tree Helmantel » Sources » " De familie Portengen: genealogie en geschiedenis van een Utrechts geslacht" van Jan Portengen; BS Amsterdam 12-3-1837, aktenr. 4-3
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" De familie Portengen: genealogie en geschiedenis van een Utrechts geslacht" van Jan Portengen; BS Amsterdam 12-3-1837, aktenr. 4-3
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