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ETHBIBFreiburg AltstadtInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Freiburg Altstadt Uploaded with GWToolset ETHBIBFreiburg AltstadtInlandflgeLBSMH epics ethz ch tif