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Portret van J.M. Tienstra door H. Vermeulen. nl Portret van Jacob Menno Tienstra door Vermeulen europeana eu html Portret van Tienstra door Vermeulen op europeana eu Vermeulen contrubutor Stichting Academisch Erfgoed data provider other versions cczero Uploaded with Engineers from the Netherlands Technische Universiteit Delft