Ice chart of the southern hemisphere. Compiled from the voyages of Cook 1772-5, Bellingausen 1819-21, Weddell 1822-4, Foster 1828-9, Biscoe 1830-2, Balleny 1839, D'Urville 1839, Wilkes 1839, and Ross 1841-2-3.
<bdi><a href="https://en.wikipedia.org/wiki/en:United_Kingdom_Hydrographic_Office" class="extiw" title="w:en:United Kingdom Hydrographic Office"><span title="UK government agency concerned with providing hydrographic and marine geospatial data">United Kingdom Hydrographic Office</span></a>
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