From: https://commons.wikimedia.org/wiki/File:1920_Chicago_map_by_Fred_Wild.jpg Uploaded by Brian Jolet. Last modified 2 months ago. 4 control points.
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File:1920 Chicago map by Fred Wild.jpg
From: https://commons.wikimedia.org/wiki/File:1920_Chicago_map_by_Fred_Wild.jpg Uploaded by Brian Jolet. Last modified 2 months ago. 4 control points. Links: Wikimedia Commons
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