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WJonckbloet. en Portrait of Willem Jozef Andries Jonckbloet professor at Leiden University Icones Leidenses Digitool Leiden University leidenuniv nl Clmence Pruijs van der Hoeven PDoldauto Uploaded with Willem Jonckbloet Clmence Pruijs van der Hoeven Icones Leidenses Photographs uploaded by User Vysotsky