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Godefroid de Callataÿ gives a lecture on ‘The Ikhwān al-Ṣafā’ on the Ṣūrat al-Arḍ: a Geography in Motion’ in Bonn, Rheinische Friedrich-Wilhelms-Universität, in a lecture series organized by Eva Orthmann in the Abteilung für Islamwissenschaft und Nahostsprachen.