Asia : South China Sea : Tung-Sha Tao (Pratas Island)
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Depths shown by shading, soundings, isolines and pictorially; Mercator projection
From a Japanese survey in 1937
Polygon: 20.83333333,116.55 20.83333333,117.0083333 20.53333333,117.0083333 20.53333333,116.55 20.83333333,116.55
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Special Collections & Archives, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/sca)
4th edition, No. 2784
Public Domain (US)
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