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Zentralbibliothek Zrich Uetliberg .tif Artwork de Uetliberg um institution Zentralbibliothek Zrich object history credit line accession number Public domain File ZentralbibliothekZrichUetliberg ZentralbibliothekZrich MediacontributedbyZentralbibliothekZrich original picture PDold Zentralbibliothek Zrich