Family tree Helmantel » Sources » http://www.rootsweb.ancestry.com/~iahenry/mtpleasantphotos.htm; logi-abo/page-10-biographical-review-of-henry-county-iowa-containing-biographical-and-genealogi-abo.shtml; "Amsterdamse Emigranten" van dr. J. Stellingwerff; Amerikaanse volkstelling 1900
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