pl23_map00187.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23map00187jpgDescription
Survey track of the Coast Survey Steamer HASSLER on the coast of Californiashowing depth profiles of the continental slope. Survey was run in 1874 andmeant to determine the 500 fathom curve.
Credit
NOAA Central Library Historical Collection
Collection
Voyage to Inner Space
History of Oceanography Collection
Bathymetric Maps Collection