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Zentralbibliothek Zrich Betsy und Conrad Ferdinand Meyer .tif Artwork de Betsy und Conrad Ferdinand Meyer um institution Zentralbibliothek Zrich object history credit line accession number Public domain File ZentralbibliothekZrichBetsyundConradFerdinandMeyer ZentralbibliothekZrich MediacontributedbyZentralbibliothekZrich original