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https://www.noaa.gov/media/digital-library-photo/pl23line3237jpgDescription
San Francisco skyline and the NOAA NOS Center for Operational OceanographicProducts tide house (small building to right on pier) as seen from the vicinityof the NOAA Gulf of the Farallons National Marine Sanctuary. The San Franciscotide gauge has produced the longest continual tidal record in the Americas. Itbegan operation on June 30, 1854. (Image credit: Captain Albert E. Theberge)