Nathan Levie Kleerekoper komt voor in de vreemdelingenarchieven van de stad Antwerpen Belgium, Antwerp Police Immigration Index, 1840-1930," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/JS1P-MJ7 : accessed 21 April 2012), Nathan Levie Kleerekoper
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