From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2839_Columbia_R... Uploaded by Kognos. Last modified almost 2 years ago. 6 control points.
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File:Admiralty Chart No 2839 Columbia River, Published 1897.jpg
From: https://commons.wikimedia.org/wiki/File:Admiralty_Chart_No_2839_Columbia_R... Uploaded by Kognos. Last modified almost 2 years ago. 6 control points. Links: Wikimedia Commons
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