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ETHBIBErlenbach ZrichseeInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Erlenbach Zrichsee Uploaded with GWToolset ETHBIBErlenbach ZrichseeInlandflgeLBSMH epics ethz ch