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Description
Hydrographic signal on the shores of the reservoir of Grand Coulee Dam.Used as signal for navigation by three-point sextant fix. (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