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ETHBIBGrasswil Seeberg BrgschiseeInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Grasswil Seeberg Brgschisee Uploaded with GWToolset ETHBIBGrasswil Seeberg BrgschiseeInlandflgeLBSMH