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ETHBIBEbenalp Altmann ChurfirstenInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Ebenalp Altmann Churfirsten Uploaded with GWToolset ETHBIBEbenalp Altmann ChurfirstenInlandflgeLBSMH