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https://www.noaa.gov/media/digital-library-photo/pl23theb4319jpg-0Description
Observing three-point sextant fix while surveyingthe reservoir of the Grand Coulee Dam. (Image credit: Family of Captain David M. Whipp, C&GS;)
Credit
Family of Captain David M. Whipp, C&GS;
Display Date
1948
Location
Washington, Grand Coulee Dam, Columbia River
Collection
Historic Coast & Geodetic Survey