File:J. C. Kapteyn - handtekening - signature.jpg
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![File:J. C. Kapteyn - handtekening - signature.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a3/J._C._Kapteyn_-_handtekening_-_signature.jpg/800px-J._C._Kapteyn_-_handtekening_-_signature.jpg?20210311111833)
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