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Fotothek df tg Geometrie Spirale. Creator Albrecht Drer Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Nr Arnheim Archimedische Spirale mit Windungen Papier Holzschnitt cm Geometrie Spirale ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte Jh Verwalter