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ETHBIBTor von TeheranPersienflug LBS MHALFL.tif Mittelholzer Walter Persienflug Zrich Orell Fssli Abb cm exhibition history Institution ETHBibliothek Fotografie Papierabzug auf Papier montiert Persienflug Reportage mit Bildern alle digitalisiert object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org