From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_527_Demerara_an... Uploaded by Kognos. Last modified almost 2 years ago. 7 control points.
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File:Admiralty Chart No 527 Demerara and Essequibo Rivers, Published 1872.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_527_Demerara_an... Uploaded by Kognos. Last modified almost 2 years ago. 7 control points. Links: Wikimedia Commons
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