<i><a href="https://en.wikipedia.org/wiki/Ocean_current" class="extiw" title="en:Ocean current">Ocean Currents</a> and Sea Ice from Atlas of World Maps</i>, <a href="//commons.wikimedia.org/wiki/United_States_Army" title="United States Army">United States Army</a> Service Forces, Army Specialized Training Division. Army Service Forces Manual M-101 (1943).
US army
Edited version of <a href="//commons.wikimedia.org/wiki/File:Ocean_currents_1943_(borderless).png" title="File:Ocean currents 1943 (borderless).png">File:Ocean currents 1943 (borderless).png</a>