From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2137_China_Sea_... Uploaded by Kognos. Last modified about 2 years ago. 10 control points.
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File:Admiralty Chart No 2137 China Sea Gaspar Strait Surveyed by Officers of the United States Navy 1854, Published 1861, Corrections to 1867.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2137_China_Sea_... Uploaded by Kognos. Last modified about 2 years ago. 10 control points. Links: Wikimedia Commons
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