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ETHBIBSchwamendingen Zrich FlugplatzMattenhof AeroLuftbildverlagsanstalt ComteInlandflgeLBS MH.tif cm exhibition history Institution ETHBibliothek Fotografie Glasplattennegativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online org Template ETHBibliothek Schwamendingen Zrich FlugplatzMattenhof AeroLuftbildverlagsanstalt