Lead line survey from a catamaran hull in Alaska, 1942.
Revised
December 12, 2006
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National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/transformations/hydrography/image7.html
National Oceanic and Atmospheric Administration | U.S. Department of Commerce
http://celebrating200years.noaa.gov/transformations/hydrography/image7.html