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Two separate maps showing the languages and dialects spoken on the islands of Bangka, and the Riouw (Riau) and Lingga archipelagos, in the late 19th century. On Bangka alone, there are 12 languages or dialects listed.

Four maps recording the rainfall, population and ethnicity, crops, and livestock of Java in the late 19th century.

Detailed topographical map of the east coast of Sumatra, spread over 36 sheets plus a cover sheet of the whole area. Mountains and forests dominate, with villages, routes and administrative borders shown. With five inset maps of individual towns.