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Three maps of the Caroline Islands. One shows colonised areas in Southeast Asia: Dutch East Indies; British North Borneo, British New Guinea; German New Guinea; Philippines (Spain); Portuguese Timor. The route of the Challenger expedition is marked.

Two maps, one of which features mainland Southeast Asia: Anam (Tonquin and Cochin China) in red, Lower Cochin China in green, Cambodia in yellow, and Siam in white. An inset map shows maritime routes between Europe and Asia.