From: https://commons.wikimedia.org/wiki/File:1887_Map_of_Chicago_and_Environs_b... Uploaded by Scewing. Last modified 9 months ago. 5 control points.
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File:1887 Map of Chicago and Environs by Blanchard.jpg
From: https://commons.wikimedia.org/wiki/File:1887_Map_of_Chicago_and_Environs_b... Uploaded by Scewing. Last modified 9 months ago. 5 control points. Links: Wikimedia Commons
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