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