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![Measuring angles with theodolite at triangulation station on Alaska Coast theb4079.jpg Measuring angles with theodolite at triangulation station on Alaska Coast](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb4079.jpg?itok=nLL0qD0E)
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Measuring angles with theodolite at triangulation station on Alaska Coast.In: Putnam, G.R. 1908. Nautical Charts. J. Wiley and Sons, New York.
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Historic Coast & Geodetic Survey