From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2754_Long_Islan... Uploaded by Kognos. Last modified about 3 years ago. 9 control points.
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File:Admiralty Chart No 2754 Long Island Sound Sheet 1 Block Island, New London, Gardiner Bay &c, Published 1860.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2754_Long_Islan... Uploaded by Kognos. Last modified about 3 years ago. 9 control points. Links: Wikimedia Commons
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