1910. Great Britain. Hydrographic Office. In lower left margin: "Small corrections II.97, IX.97, ... VI.10."; Relief shown by hachures and spot height. Depth shown by bathymetric soundings.... The Admiralty (London).
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United States, Hydrographic Office. From a survey by U. S. S. Mohican in 1888 with additions by U. S. S. Sumner in 1942. Coordinates approximate and based on Greenwich meridian. Depth... U.S. Navy Hydrographic Office,.