From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2843f_Chesapeak... Uploaded by Kognos. Last modified about 2 months ago. 4 control points.
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File:Admiralty Chart No 2843f Chesapeake Bay Sheet 6, Published 1861, Large Corrections 1890.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2843f_Chesapeak... Uploaded by Kognos. Last modified about 2 months ago. 4 control points. Links: Wikimedia Commons
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