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| Keywords: Heliograph.jpg heliograph - Signaling with heliograph near Monument 92 Alaska - Canada border International Boundary Commission NOAA's http //www photolib noaa gov/cgs/index html Historic C GS Coast and Geodetic Survey Collection Image ID http //www photolib noaa gov/htmls/theb1633 htm theb1633 1910 http //www noaa gov/ US National Oceanic and Atmospheric Administration PD-USGov Heliographs 1910 in Alaska | ||||
