From: https://commons.wikimedia.org/wiki/File:1853_Chicago_map_by_Henry_Hart.jpg Uploaded by Scewing. Last modified over 3 years ago. 21 control points.
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File:1853 Chicago map by Henry Hart.jpg
From: https://commons.wikimedia.org/wiki/File:1853_Chicago_map_by_Henry_Hart.jpg Uploaded by Scewing. Last modified over 3 years ago. 21 control points. Links: Wikimedia Commons
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