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ETHBIBTschadseeflug .tif exhibition history Institution ETHBibliothek Fotografie Negativ object history PDoldauto Creator Walter Mittelholzer EPics Bildarchiv online Public Domain Mark Template ETHBibliothek Uploaded with GWToolset ETHBIBTschadseeflug epics ethz ch tif ETHBIB MittelholzerLake Chad flight Aerial photographs by