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ETHBIBGruppe vor HhleTschadseeflug LBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Negativ Tschadseeflug Reportage mit Bildern alle digitalisiert object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Gruppe vor Hhle Uploaded with GWToolset ETHBIBGruppe