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ETHBIBFestung am BosporusWeitereLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Negativ Balkanflug Teilstrecke nach Istanbul Reportage mit Bildern alle digitalisiert object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Festung am Bosporus Uploaded