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ETHBIBChessel SpreitenbachInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Chessel Spreitenbach Uploaded with GWToolset ETHBIBChessel SpreitenbachInlandflgeLBSMH epics ethz