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Map of the district of Bhamo in northern Burma (Myanmar) featuring the Irrawaddy River, railways (proposed and under construction, including the future Burma State Railway), and mines (amber, jade).

Map of the district of Ruby Mines in northern Burma (Myanmar) featuring the Irrawaddy and Shweli rivers. High points are marked with their heights so they can be used for triangulation. As the name suggests, the district was known for its rubies.

Map of the Katha district, Burma (Myanmar), with locations of gold mines and land allocated for prospecting. High points are marked and linked with lines to create a triangulation network. The Mu Valley State Railway and Mu River are shown.

Map highlighting areas of eastern Siam (Thailand) claimed by France. Notes describe Siam’s geography, government, population, military and trade (rice, teak, pepper, bullocks, fish, hides, tin, cardamom, tin), including trading partners by tonnage.