From: https://commons.wikimedia.org/wiki/File:1884_map_of_Chicago_showing_extens... Uploaded by Scewing. Last modified about 8 years ago. 8 control points.
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File:1884 map of Chicago showing extensions to city limits.jpg
From: https://commons.wikimedia.org/wiki/File:1884_map_of_Chicago_showing_extens... Uploaded by Scewing. Last modified about 8 years ago. 8 control points. Links: Wikimedia Commons
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