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Fotothek df tg Akustik Schall Echo Ordensliteratur. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Ellwangen Reflexion des Schalls aus unterschiedlicher Entfernung Echo Papier Holzschnitt cm Akustik Schall Echo Ordensliteratur ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt