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ETHBIBEtzel Einsiedeln im Dunst Alptal Tal von Rothenturm Rigi im Nebelmeer v. N. O. aus mInlandflgeLBS MH.tif Am Horizont die Berner Alpen vom Finsteraarhorn zur Jungfrau cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org