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ETHBIBWienWeitereLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Negativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Wien Uploaded with GWToolset ETHBIBWienWeitereLBSMH epics ethz ch tif ETHBIB MittelholzerVarious flights abroad Aerial photographs