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recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Des_Bildhauergesellen_Franz_Ferdinand_Ertinger_Reisebeschreibung_du...
recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Ouresiphoites_Helveticus,_sive,_Itinera_per_Helvetiae_alpinas_regio...