Signaling with heliograph near Monument 92.
Alaska - Canada border.
International Boundary Commission
Image ID: theb1633, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Location: Alaska - Canada Boundary
Photo Date: 1910
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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November 10, 2017