From: https://commons.wikimedia.org/wiki/File:Map_of_the_environs_of_Washington_... Uploaded by Scewing. Last modified 7 months ago. 3 control points.
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File:Map of the environs of Washington - compiled from Boschkes' map of the District of Columbia and from surveys of the U.S. Coast Survey showing the line of the defences of Washington as constructed LOC 88690673.tif
From: https://commons.wikimedia.org/wiki/File:Map_of_the_environs_of_Washington_... Uploaded by Scewing. Last modified 7 months ago. 3 control points. Links: Wikimedia Commons
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