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Map of two districts in northern Burma (Myanmar) featuring the Irrawaddy River, the Burma State Railway (and others under construction), and mines (ruby, amber, jade). High points are marked with their heights so they can be used for triangulation.

Map of the district of Katha in northern Burma (Myanmar) featuring the Irrawaddy River, and the Mu Valley State Railway (still partially under construction). High points are marked with their heights so they can be used for triangulation.

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.

A map surveying coal fields close to the Chindwin River in Upper Burma (Myanmar). Mountains are shown by using hachures: short lines/dashes that give a sense of the shape and steepness of terrain. Survey stations are marked with their height.