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Portret van Prof. Dr. C.J. van Nieuwenburg door G. de Zoete. en Geschilderd portret van van Nieuwenburg hoogleraar chemische microanalyse door Gerard de Zoete europeana eu html Portret van Prof Dr van Nieuwenburg door de Zoete op europeana eu Gerard de Zoete creator Stichting Academisch Erfgoed data provider other versions