pl23_map00218.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23map00218jpgDescription
Section of Bathymetric Chart of the Northwest Pacific showingarea aound Mariana Trench. Note unique contouring and shading.Japanese Hydrographic Office Bathymetric Chart 6901 published byGeol. Soc. America.
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Voyage to Inner Space