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ETHBIBRmisches Theater PetraAbessinienflug LBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Negativ Abessinienflug Hinflug Rckreise Reportage mit Bildern alle digitalisiert object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Rmisches Theater Petra