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Fotothek df tg Geometrie Trigonometrie. Scan Deutsche Fotothek dftg color MIKCenter Berlin GmbH Abbildung Nr Nrnberg Berechnung der Gren von gegebenen Dreiecken Papier Kupferstich cm Geometrie Trigonometrie ppn Druck Deutsche Fotothek gefrdert von der Deutschen Forschungsgemeinschaft Projekt Technikgeschichte Jh Verwalter