Mennonites from Groningen » Sources » "De Krant van Toen"; Alle Groningers; http://twierstr.home.xs4all.nl/Grijpskerk/nummerbewijzen.html; http://tijdschriften.kb.nl/nl/results/index/query/kruisinga+grijpskerk/maxperpage/10/coll/dts/page/3
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