National Geographic Society. Cartographic Division. North Decimal Degree 80.000000. South Decimal Degree -90.000. East Decimal Degree 90.000. West Decimal Degree -100.000. Relief shown by shading and spot heights. Depths shown by isolines, gradient tints and soundings in fathoms,"Supplement to the National Geographic, February 1965, vol. 127, no. 2." Ancillary maps: The United Nations; Population density; Vegetation and land use; International time zones; [Antarctica]; [Arctic Ocean]. Map shows prevailing winds and ocean currents.