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In page Hakka people:

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The study of the Hakka people first drew attention to Chinese and foreign scholars, adventurers, missionaries, travellers and authors of the Taiping Heavenly Kingdom era. Ernest John Eitel, a prominent German missionary, was one of those who took a great interest in this area.[1] Theodore Hamberg, who also wrote an early English-language account of the Taiping Rebellion, is also considered a forefather of Hakka studies in the West.[citation needed]