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The residency of Soerabaja, East Java, featuring crops (coffee, coconut, sugarcane, rice, alang-alang, bamboo) and fishing ponds. Three inset maps: a triangulation map; a map of distances between settlements by types of transport; Bawean Island.

A map of the residency of Soerabaja (East Java) divided into regencies, departments and districts. There are large fishing ponds around the coasts. An inset map shows distances between settlements by road, tracks and paths.

Topographic map of the island of Bawean in the Java Sea, with terrain shown by contour lines, and mountains labelled with their heights. Villages, forests (heavy, light, teakwood) and crops (coconut, coffee, alang-alang, rice, bamboo) are marked.

The residency of Soerabaja, East Java, featuring crops (coffee, coconut, sugarcane, rice, alang-alang, bamboo) and fishing ponds. Three inset maps: a triangulation map; a map of distances between settlements by types of transport; Bawean Island.