Anna Plas was a daughter of Arie Joseph Slier and Vrouwtje Sons. With her husband, Anna Plas had a stand at the Nieuwmarkt in Amsterdam. At this market they sold fabrics and ornaments.
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In addition, a Jokos file (number 10771) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.