Korean dialect zones identified by Shinpei Ogura
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<p><span class="int-own-work" lang="en">Own work</span>
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<ul><li>outline data from Natural Earth 10m</li>
<li><cite class="book" style="font-style:normal" id="Reference-Ogura-1944">Ogura, Shinpei (1944)    (in Japanese)  <i> Chōsen-go hōgen no kenkyū</i>, 2, <a href="https://en.wikipedia.org/wiki/en:Tokyo" class="extiw" title="w:en:Tokyo"><span title="capital and largest city of Japan">Tokyo</span></a>:  Iwanami Bunko  <small><a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="en:Digital object identifier">DOI</a>:  <a rel="nofollow" class="external text" href="https://dx.doi.org/10.11501/1869845">10.11501/1869845</a>. </small></cite></li></ul>