United States, Hydrographic Office. Relief shown by spot heights and soundings. "Soundings in fathoms, heights in feet." "No. 5504.". Hydrographic Office.
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United States, Hydrographic Office. This map stretches from Sumatra in the southwest to the lower tip of Vietnam (CochinChina) in the north to 'Netherlands Borneo' in the south east. ... Hydrographic Office under the authority of the Secretary of the Navy.