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ETHBIBSntis Churfirsten v. N. aus mInlandflgeLBS MH.tif Zeitgenssische Bildbeschreibung des SwissairMarketings Sntis Nordwestwand Altmann Potersalp und Churfirsten aus Hhe cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online