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| Keywords: Johann Wilhelm Spengel.jpg en German zoologist Johann Wilhelm Spengel 1852-1921 Johann Wilhelm Spengel 1852-1921 um 1912 Festschrift zum sechzigsten Geburtstage des Herrn geheimen Hofrats Prof Dr Johann Wilhelm Spengel in Gießen 1912 author before 1913 Johann Wilhelm Spengel Black and white photographic portraits of male scientists PD-old | ||||
