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Letters, reports, account books and remittance receipts resulting from communications between Chinese emigrants overseas and their families in China. They record first-hand the contemporary livelihood and activities of Overseas Chinese in Asia, North America and the Oceania, as well as the historical and cultural development of their residing countries in the 19th and 20th century. They constitute evidence of the Chinese international migration history and the cross-cultural contact and interaction between the East and the West.