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Rasāʾil Ikhwān aṣ-Ṣafāʾ wa-Khillān al-Wafāʾ, (2nd half 4th/10th cent.), written by Ikhwān al-Ṣafāʼ., is now in the public domain and available here for free download. this title joins thousands of works in our science collection.

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