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ETHBIBBernInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Bern Uploaded with GWToolset ETHBIBBernInlandflgeLBSMH epics ethz ch tif ETHBIB MittelholzerInland flights Aerial