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ETHBIBMonte Rosa und Lyskamm Grenzgletscher Gornergletscher Zwillingsgletscher v. N. W.InlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Monte Rosa und Lyskamm Grenzgletscher