From: https://commons.wikimedia.org/wiki/File:1855_Chicago_map_by_Hall_%26_Co.jp... Uploaded by Scewing. Last modified almost 7 years ago. 5 control points.
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File:1855 Chicago map by Hall & Co.jpg
From: https://commons.wikimedia.org/wiki/File:1855_Chicago_map_by_Hall_%26_Co.jp... Uploaded by Scewing. Last modified almost 7 years ago. 5 control points. Links: Wikimedia Commons
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