From: https://commons.wikimedia.org/wiki/File:South_China_Sea_and_the_Gulf_of_To... Uploaded by Martin Poulter. Last modified almost 10 years ago. 5 control points.
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File:South China Sea and the Gulf of Tonkin 1701.jpg
From: https://commons.wikimedia.org/wiki/File:South_China_Sea_and_the_Gulf_of_To... Uploaded by Martin Poulter. Last modified almost 10 years ago. 5 control points. Links: Wikimedia Commons
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