From: https://commons.wikimedia.org/wiki/File:Admirlty_Chart_No_1740_Canton_Rive... Uploaded by Kognos. Last modified about 1 year ago. 6 control points.
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File:Admirlty Chart No 1740 Canton River Sheet 3, Published 1930.jpg
From: https://commons.wikimedia.org/wiki/File:Admirlty_Chart_No_1740_Canton_Rive... Uploaded by Kognos. Last modified about 1 year ago. 6 control points. Links: Wikimedia Commons
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