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ETHBIBFlugzeug ber der Magadinoebene Gaggiolo aus mInlandflgeLBS MHAL.tif Aeroplano sopra il Piano di Magadino con Gaggiolo cm exhibition history Institution ETHBibliothek Fotografie SilbergelatineAbzug auf Papier montiert LBS MH object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek