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WOODEN TOWERS & SIGNAL POLES
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Coast-Geodetic-Survey
Geodesy
Triangulation
Wooden Towers & Signal Poles
Geodesy
Tower at Station Indian covered with ice and frost.Station is just below the Arctic Circle.Triangulation party of Walter R. Helm
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Small wooden stand on ridge in Mojave Desert.Station built during observations on Transcontinental Traverse work.Triangulation party of Woodrow Johnson
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