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https://www.noaa.gov/media/digital-library-photo/pl23cgs02485jpgDescription
Lieutenant Ray Jackson operating level instrument during tidal benchmark leveling operations. (Image credit: Collection of NOAA Center for Operational Oceanographic Products and Services)
Credit
Collection of NOAA Center for Operational Oceanographic Products and Services
Collection
Historic Coast & Geodetic Survey
Keywords
Coast and Geodetic Survey