Family tree Helmantel » Sources » "Amsterdamse Emigranten, onbekende brieven uit de prairie van Iowa" door dr. J. Stellingwerff; " Iowa letters: Dutch immigrants on the American frontier" van Johannes Stellingwerff en Robert P. Swierenga; " De familie Portengen: genealogie en geschiedenis van een Utrechts geslacht" van Jan Portengen
Source description
"Amsterdamse Emigranten, onbekende brieven uit de prairie van Iowa" door dr. J. Stellingwerff; " Iowa letters: Dutch immigrants on the American frontier" van Johannes Stellingwerff en Robert P. Swierenga; " De familie Portengen: genealogie en geschiedenis van een Utrechts geslacht" van Jan Portengen
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