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Zentralbibliothek Zrich Kratzquartier Zrich .tif Artwork de Kratzquartier Zrich institution Zentralbibliothek Zrich object history credit line accession number Public domain File ZentralbibliothekZrichKratzquartierZrich ZentralbibliothekZrich MediacontributedbyZentralbibliothekZrich original picture PDold Historical photographs