Rock cairn signal at divide between two main forks of the Ladue River. International Boundary Commission surveyor
Image ID: theb2486, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Location: Alaska-Canada Boundary 141st Meridian Photo Date: 1911 Credit: National Geographic Magazine July 1912 Category: Geodesy/Triangulation/Towers/Wooden/ • High Resolution Photo Available
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