Relief shown by spot heights, and hachures. Depths shown by soundings (in feet), and isolines. Includes text and charts. "No. 369." "Electrotype co... U.S. Coast and Geodetic Survey.
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U.S. Coast and Geodetic Survey. Depths shown by isolines and soundings. Relief shown by hachures. "Soundings in feet." Includes tables of channel depths, tidal information, and lo... U.S. Coast and Geodetic Survey.