From: https://commons.wikimedia.org/wiki/File:Pitner%27s_map_of_greater_Washingt... Uploaded by Scewing. Last modified about 2 years ago. 3 control points.
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File:Pitner's map of greater Washington, 1938 ce.jpg
From: https://commons.wikimedia.org/wiki/File:Pitner%27s_map_of_greater_Washingt... Uploaded by Scewing. Last modified about 2 years ago. 3 control points. Links: Wikimedia Commons
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