voorouders van der Ploeg-Mosterman » Sources » https://historischcentrumleeuwarden.nl/onderzoek/archievenoverzicht?mivast=76&mizig=210&miadt=76&micode=1153&milang=nl&mizk_alle=1153%20Sint%20Anthony%20Gasthuis%201425-1813&miview=inv2#inv3t2
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