From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_1263_Entrance_t... Uploaded by Kognos. Last modified about 2 months ago. 5 control points.
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File:Admiralty Chart No 1263 Entrance to the Canton River, Published 1840.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_1263_Entrance_t... Uploaded by Kognos. Last modified about 2 months ago. 5 control points. Links: Wikimedia Commons
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