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ETHBIBTriftgletscher Grimsel v. N. aus mInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Triftgletscher Grimsel aus Uploaded with GWToolset ETHBIBTriftgletscher Grimsel aus