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ETHBIBBittwil Grasswil Seeberg Steinenberg Steinhof v. N. aus mInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Bittwil Grasswil Seeberg Steinenberg Steinhof aus Uploaded