The Grierson map is taken from <a class="external free" href="https://commons.wikimedia.org/wiki/File:Map_of_the_Languages_and_Dialects_of_the_B%C3%A2r%C3%A2_or_Bodo_Group_of_the_Tibeto-Burman_Family_(cropped).jpg">https://commons.wikimedia.org/wiki/File:Map_of_the_Languages_and_Dialects_of_the_B%C3%A2r%C3%A2_or_Bodo_Group_of_the_Tibeto-Burman_Family_(cropped).jpg</a>
<a href="//commons.wikimedia.org/wiki/User:Chaipau" title="User:Chaipau">Chaipau</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>