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ETHBIBOberwinterthurInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Oberwinterthur Uploaded with GWToolset ETHBIBOberwinterthurInlandflgeLBSMH epics ethz ch tif ETHBIB MittelholzerInland