Preliminary chart : Japan : Nanpo Shoto (Southern Islands) : Ogasawara Gunto (Bonin Islands); Mukoshima Retto
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Depths shown by soundings and isolines
From Japanese surveys between 1911 and 1913 with additions to 1944
Polygon: 27.75,142.0333333 27.75,142.45 27.45,142.45 27.45,142.0333333 27.75,142.0333333
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Special Collections & Archives, UC San Diego, La Jolla, 92093-0175 (https://lib.ucsd.edu/sca)
1st edition, No. 6107
Public Domain (US)
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