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ETHBIBTnzerTschadseeflug 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 Tnzer Uploaded with GWToolset ETHBIBTnzerTschadseeflug LBSMH