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Tārīkh al-Hind, or "The History of India", was a treatise written by Al-Biruni on Indian culture. It was written in Persian and is considered one of the most important works on Indian history. The book covers a wide range of topics, including Indian religion, philosophy, science, and society. Tārīkh al-Hind is a valuable source of information on India during the medieval period, and it has been translated into many languages.