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ETHBIBPorchabellagletscher Piz Kesch Engadin 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 Porchabellagletscher Piz Kesch Engadin aus Uploaded with GWToolset