From: https://commons.wikimedia.org/wiki/File:Map_of_the_location_of_tunnel_unde... Uploaded by Pechristener. Last modified about 4 years ago. 3 control points.
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File:Map of the location of tunnel under East River constructed by the East River Gas Company.jpg
From: https://commons.wikimedia.org/wiki/File:Map_of_the_location_of_tunnel_unde... Uploaded by Pechristener. Last modified about 4 years ago. 3 control points. Links: Wikimedia Commons
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