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Hamburger Rathaus Baumeister . Artwork en Architects of Hamburg town hall part Hugo Stammann Bernhard Hanssen Johannes Grotjan Gustav Zinnow de Baumeister des Hamburger Rathauses Teil Hugo Stammann Bernhard Hanssen Johannes Grotjan Gustav Zinnow ca drawing Hamburger Kunstalle Buch Allers Unser Bismarck Seite Tafel IX Originalzeichnung