From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_622_Bonny_and_N... Uploaded by Kognos. Last modified about 1 year ago. 4 control points.
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File:Admiralty Chart No 622 Bonny and New Calabar Rivers, Published 1914, New Edition 1930.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_622_Bonny_and_N... Uploaded by Kognos. Last modified about 1 year ago. 4 control points. Links: Wikimedia Commons
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