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| Keywords: Heliotrope3.jpg en A heliotrope on signal stand ready for work Heliotrope set up at lightkeeper's camp Somewhere in Idaho or Montana Triangulation party of William M Scaife NOAA's http //www photolib noaa gov/cgs/index html Historic C GS Coast and Geodetic Survey Collection Image IDs http //www photolib noaa gov/htmls/cgs00526 htm cgs00526 http //www photolib noaa gov/htmls/theb1637 htm theb1637 and http //www photolib noaa gov/htmls/theb2646 htm theb2646 http //www noaa gov/ US National Oceanic and Atmospheric Administration ~ 1922 PD-USGov Triangulation Heliotrope | ||||
