Frankfurter Allgemeine Zeitung (in German). ISSN 0174-4909. Retrieved 2023-01-02. Ruthe, Ingeborg (2022-11-29). "Rekordverdächtige Auktions-Sensation: Max Beckmanns...
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the Friedrich-Wilhelms-Gymnasium. He learned botany from Johann Friedrich Ruthe. In 1837 he graduated Ph.D. from the University of Berlin with a dissertation...
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