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A sketch of the river networks discharging into the Gulf of Siam (Gulf of Thailand), derived from the observations of mid-19th century American missionaries. Settlements along the rivers are noted, as are areas where sugarcane was grown.

Regional and local borders are colour-coded, with mountains and rivers, settlements, paths/roads and names of local peoples marked. Notes such as ‘Gold dust found in these streams’ and ‘Rich in Tin’ add detail. Only two of four sheets are available.