United States, National Ocean Service. National Ocean Service. Depths shown by isolines, soundings and gradient tints. Shipping list no.: 89-745-P. Includes hydrographic survey index and... National Ocean Service,.
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U.S. Coast and Geodetic Survey. Depths shown by shading and soundings. Relief shown by hachures. "Soundings in fathams ... and feet." Includes tida... U.S. Coast and Geodetic Survey.