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ETHBIBMacchi M. CH der Ad Astra Aero AG im Flug ber dem GreifenseeInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Macchi CH der Ad Astra Aero AG im Flug ber dem Greifensee