From: https://commons.wikimedia.org/wiki/File:Map_1857_Saratov_and_Astrakhan_Pro... Uploaded by Svetlov Artem. Last modified about 4 years ago. 10 control points.
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File:Map 1857 Saratov and Astrakhan Province.png
From: https://commons.wikimedia.org/wiki/File:Map_1857_Saratov_and_Astrakhan_Pro... Uploaded by Svetlov Artem. Last modified about 4 years ago. 10 control points. Links: Wikimedia Commons
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