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ETHBIBFlugplatz Birrfeld Brugg Aare Reuss Limmat v. S. aus mInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Flugplatz Birrfeld Brugg Aare Reuss Limmat aus Uploaded with