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ETHBIBSteffisburg aus mInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie SilbergelatineAbzug object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Steffisburg aus Uploaded with GWToolset ETHBIBSteffisburg aus mInlandflgeLBSMH epics ethz ch tif