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Jakob Philipp Hackert The Cascata delle Marmore at Terni Google Art Project. Prenzlau Rome Jakob Philipp Hackert Jakob Philipp Hackert Museum Kunstpalast Dsseldorf smkp de Graphitstift und Feder in Braun False KA FP smkp de Museum Kunstpalast Dsseldorf Sammlung der Kunstakademie NRW photo Horst Kolberg