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JMvanBemmelen. en Jacob Maarten van Bemmelen Leiden professor chemistry painting made in by Menso Kamerlingh Onnes Icones Leidenses leidenuniv nl Leiden University Menso Kamerlingh Onnes PDold Uploaded with Icones Leidenses Leiden University faculty Menso Kamerlingh Onnes Rectores magnifici from Leiden University Photographs